Hey Everyone! So we've finally reached the end of this story! I know it's been incredibly sad, but as some of you said, the song isn't a very happy one. Mostly about regrets. But mostly I wanted to show things in Mark's life that drove him to do some of the things people don't like him for. Atleast my version of it anyway. But ANYWAY! This is it. This is what it all led up to. It's kind of short, but I think it gets the point across. I didn't want to drag it on too long bc I have a tendency to get repetitive! Anyway! I hope you guys like how it ends! Let me know!!

If only I'd've known
That later on down the road
I'd look back and not like what I see

To my surprise, Derek actually stops in his tracks before he ever opens the door. And even though he doesn't turn around, I know this is my chance. I know I have to make things right. I glance back at Addison helplessly, her hands somehow intertwined with mine. "He's Derek." I echo the words she'd just spoken to me, and all I can do is hope that she understands.

My heart drops into my stomach as she untangles her hands from mine, but it rises as they make their way to my face. "Find me later?"

I simply nod, because I can't manage anything else. I watch silently as she makes her way past Derek without so much as a touch or a glance in his direction before leaving the closet.

Once she's gone, he turns back around to face me, and even though I'm not positive because the closet is rather dark, I swear I see a smile on his face.

"You could have found me later, ya know?" He finally spoke as he finally took a seat next to me instead of on the other wall like before.

"No, I couldn't. Because.. because I need you to understand something. I mess up. I mess up a lot. I'm flawed. But you.. you know that. You know me better than anyone. And you have to know how much I love Addison. I have to believe that if you really know that, how much I really want to be with her, then you could forgive me."

"I do know that you love her. I think I've always known. At least somewhat." Derek sighs as he runs his fingers through his tangled hair. "It's just.. she was my wife, Mark."

"I know that. It's why I kept it to myself for so long, but then you.. changed. I used to be the workaholic between the two of us, Derek. But suddenly you were scheduling surgeries in the middle of the night instead of going home, or practically doing the nurse's job instead of making it to anniversary dinners. She looked to me for answers, and I had none for her. You guys weren't 'Derek and Addison' anymore. You were just Addison. Then at some point, you started sending me in your place, and then ever further down the line, she just stopped asking you because she knew you wouldn't show. Ignorance is bliss, Derek. Then one night, I stopped by your place with Chinese food. She'd called me and told me she hadn't talked to you in days, and that she didn't even know if you still lived there anymore. So on the way over, I picked up a bottle of Jack Daniels. I wasn't planning on drinking any. It was for her. But I got there, and she popped in a chick-flick. A chick-flick, Derek. I needed the damn drink just to survive. Half an hour in, we'd dismissed the shot glasses for wine glasses, and just filled them to the brim with the whiskey. I don't know who started it, or how in the hell we ended up in your bed for you to walk in and see, but it did. And I'm sorry that you had to see it. And I'm sorry that I was too drunk to even realize the enormous mistake that I'd made. I just knew that you would show up at the office the next day, and we'd talk through it. But you didn't. You were gone."

"Mark.." Derek begins, but I cut him off before he can say more.

"I'm not done!" I quip back, and he gives in and lowers his head to brace himself for the rest.

"After about a week, I just performed the basic surgeries that you had scheduled that I was confident enough to do, and the rest I apologized profusely to, and sent them on their way. This one family harassed me for weeks about your where abouts, and all I could tell them was there was a tragic loss in the family. Eventually, the calls died down, and I removed your name from the door. Addison grew to hate the brownstone. I don't know if it was because it reminded her of you, or me, but she did. So she moved in with me, and even though I never saw her without her wedding ring, I convinced myself that I could make her happy. And damn it, I tried so hard. But it was never good enough. If I got her flowers, they weren't the right color, and if I got her chocolate, she wanted a different filling. And eventually, my patience wore thin. Until one day I walked into my, our, apartment to find her crying on the couch. She was staring down at a box on the table, and it wasn't until I sat down beside her that I realized it was a pregnancy test box. I never wanted kids, Derek. Honestly, they are just a little too loud and annoying for me to handle, but I saw that box, and I just.. I could not stop smiling. Because it wasn't just my baby, it was Addison's! And I knew that if I had her, I'd be okay. I could handle it. damn it, I couldn't wipe the stupid smile off my face for a week. I even went out and bought a Yankees uniform thingy for it, and a calender that had her due date circled in red marker. I was so excited to show Addison, I just knew she would be so proud that I made the effort. But I got home, and I knew something was off. The place was silent. Eerily silent. No cries, no laughter, not even any machines going." I take a deep breathe to steady my voice, because I know if I don't, I'm going to lose my grip. I need my grip. "I found her lying in bed in one of your shirts. And even though her eyes were closed, I knew she wasn't asleep, because she always makes this comforting humming noise when she sleeps. I walk over to her with the bag behind my back so I can surprise her. When I climbed onto the bed, she winced, and her hands instantly flew to her mid region. And then I knew what she did and why, without her saying anything. She killed my baby because it wasn't yours. I didn't even say anything, I just dropped the bag onto the bed, and left."

"So that's why you cheated?" Derek asks, and surprisingly, he doesn't even look upset. Possibly a little sad, but not angry. Apologetic mostly, which I find odd considering who's at fault in this relationship.

I can't bring myself to answer, so I simply continue my story. "I went to Randy's bar, because the only thought I could put together in my head was that alcohol was completely necessary in this situation. I'd expertly avoided Randy's since you left, but I just... I needed you to be with me on some level, even if you weren't. But you weren't there. Nicole was. And by the time I left, I honestly couldn't even tell what color her eyes were I was so wasted. I wouldn't be surprised If I called her Addison. She made me forget about the baby. At least for a little while, and then I spent the next night in an on call room with some nurse.. And the next I went to another bar, far away from Randy's, because by then I was ashamed at what I'd done. But that didn't stop me from going home with Charlene. Addison still hadn't called me, and I'd be damned if I was going to call her first."

"I'm sorry she did that, Mark. I'm sorry that I didn't end the marriage before it ruined our friendship. I'm sorry that I was here instead of at Randy's to tell you to be careful, even if it would have hurt like hell to tell you so. And I'm sorry that Addison got no closure to the point she killed your child. I'm just.. I'm sorry."

"I finally went home a week later to find that Addison's stuff was all packed. It was strange because despite the random boxes through out the place, it was possibly the cleanest that apartment had EVER been." I let out a small laugh simply because it's all I can bring myself to do. Even now it seems so unreal. "I'd be lying if I said it didn't hurt. It did. Like hell. But I'd accepted that I couldn't make her happy, so I simply sat in my recliner in the living room, and listened to her finish packing. I eventually left again, and when I came back she was gone."

"She really did give me divorce papers. It's my fault she didn't come back. I just.. I couldn't sign them. Even after everything that'd happened, I couldn't become another divorced statistic."

"So eventually I flew out here. Hell, I had nothing to lose. Weis had told me that you two were working it out, and I just.. I couldn't believe it. So I came out here to see for myself. And you'd managed to fall in love with an INTERN!" I let out a small laugh as I recall the memory. "I remember telling Meredith that at some point the cards have to fall on the sides of the dirty mistresses."

"Oh, so that's why you hit on her!" Derek laughs loudly and I shake my head.

"Hey! I didn't know, okay?" I grin as my muscles finally relax from their stiff position. "But I did know that you didn't love Addison anymore."

Derek's smile faded once again, and I silently berate myself for bringing it back up. "You know, I really did love Addi. But Meredith.. what I feel for her.. is a completely new feeling."

"I'm really happy for you, Derek." I nudge his shoulder with my own. "And I'm damn happy that you and Addison didn't get the happily ever after. Because that would of sucked pretty damn bad."

"So you and Addison, huh?" Derek smiled at me.

"I hope so." I grin as I twist my fingers tightly.

"Well look on the bright side, I'll be at Joe's to kick your ass if you decide to be a man whore again."

"Good to know." I laugh, finally making my way own to my feet. "Is it me or does today finally seem like a good day?"

"Seems pretty damn good to me, Sloan." He replies with a smile, making his way to his feet as well.

"Where you going?" I raise an eyebrow at him curiously.

"To get some company." He grins and I can't help but laugh.

"I always knew Grey had a kinky side."

"Back off Sloan!" I laugh as I raise my hand in surrender.

"Fine fine. I'm going to find Addi anyway."

Whoa, I'd've changed a lot of things
Startin' with me
Startin' with me

Unfortunately, as soon as I left the closet, I was paged into an emergency surgery. So I can't say I'm too surprised to find Addison already at Joe's. Even from my spot at the door, I can see her looking around, probably degrading every couple she sees, whether they are happy or not. Probably even telling herself that being divorced isn't so bad, even though her ex husband is sitting in this same bar happily with another woman, a much younger woman. She barely even gives me a glance as I take the seat next to her, and even though I can see the corner of her lips fighting to turn upwards, she turns just enough away for me not to be able to see them win.

"So I found you." I say with a nervous grin on my face.

"Here I am." She finally looks at me after downing a shot.

"Me too."

"So you and Derek are friends?" She asks, and even though I'm sure she's doubtful, I can see a glimpse of hope in here eyes. I glance back towards the back booth of the bar at Derek before nodding my head.

"We're okay." I smile and offer him a small wave, that he actually returns. "So what am I suppose to do, Addi?" I ask as I finally meet her gaze again.

"There have to be rules, Mark." She smiles at me, and even though there's nothing I hate more than rules, I nod my head in agreement.

"Are these those kind of rules that are never said but are suppose to be understood? Or are you going to be very very clear?" I ask, hoping for the latter.

"Oh. These will be crystal clear." She smiled as she grabbed onto my upper thigh tightly, causing me to swallow the rather large lump in my throat that'd formed. It's only now that I realize just how many drinks she'd had prior to my entrance. "No screw buddies. No old girlfriends. No throwing the baby in my face every fight, and absolutely NO adoration of Meredith Grey!" She tightens her grip to let me know that she isn't kidding, and so I bite my tongue to keep in the sevreral inappropriate comments that filtered through my mind during the speech.

"You're my only one. Got it." I smile as I lean in to kiss her, but they only meet her palms. I open my eyes to find that her eyes are practically dancing in amusement. I reluctantly pull back. "There's more?"

"Just one." She smiles so sweetly that it almost makes me question if it's really her. Sweet has never really been one of Addison's strong attributes.

"Ok." I nod my head to indicate for her to continue.

"If you break any of the aforementioned rules, you will be castrated slowly with no anastesia using only my perfectly manicured nails. Understood?" She's leaning in so close that it's about every ounce of resistance in me to not kiss her, but as her hands travels even further up my thigh for emphasis, I grab her hand instead.

"Got it." I mutter, almost painfully, as I bring her hand to my lips to kiss. "I love you, Addi."

Her features soften considerably at me as she leans into my ear. "So what are we still doing here?"

A grin overtakes my features as I quickly stand up, not even bothering to drink the scotch that Joe had sat down on the bar for me. "I can fix that." I chuckle as I pull her to her feet as well, careful to steady her.

"I don't doubt that." She grins as she wraps her arms around my neck, pulling me into a kiss. "God, I've missed you."

I grin as I pull away, just long enough to wrap my arms around her from behind. "Let's go, babe." I softly kiss her neck before leading her out the door, laughing softly as I hear two whistles coming from the bar that I know are Meredith and Derek, even though I don't bother to turn around.

The End! Thanks so much to everyone who reviewed, and stuck with it! I know it was incredibly sad pretty much right up to the ending, but either way! Thank you all so much! I hope the ending was worth the wait!