This will be my first attempt at a The 100 FF, I hope you all enjoy...

This is set modern day.

Please review, I love feedback, good and bad :)

Chapter 1

I stumbled through the halls aimlessly. I felt like a teenager all over again, being wasted at some party, crying over my boyfriend hooking up with someone other than me. He promised me that it was over a long time ago but I how can I believe that when I just witnessed them together with my own two eyes. I knew it was a mistake to drink, especially since it's been far too long since the last time I even had a sip. I should have just taken off, I should have gotten into my car and went home but instead I stayed and got drunk.

I walked into one of the many bedrooms this house had, I needed somewhere to sit, somewhere to think without all the people around, without the loud music. I sat on the bed and put my head into my hands and began crying immediately. When I heard a door open I looked up just in time to see a man with curly brown hair walk out of the attached bathroom.

When he saw me sitting there he said "Sorry I hadn't realized anyone was in here."

I sniffled, "I wasn't, just got here."

"Hey you alright?" He looked at me with concerned eyes.

I nodded.

He walked toward me. "Are you sure? You don't look alright."

I looked up at him just in time for fresh tears to start staining my cheeks.

"Your Finn's wife right? Do you want me to get him?"

"NO" I shouted "He's a little preoccupied right now."

He gave a look of understanding. "I'm sorry."

"Why are you apologizing? You're not the one fucking someone who isn't your wife in another room." I was furious.

He sat next to me, cautiously putting his arm around me. He let me lay my head on his shoulder.

"I can't believe he's doing this to me again, I thought they were over a long time ago." I sobbed "I would have never agreed to marry him if I thought he would have went back to her again."

"So this isn't the first time?" He asked.

I shook my head. "How stupid am I?"

He pulled back from me, looked me straight in my eyes and said "You are not stupid, don't think this is your fault, it's no one's but his."

I knew inside me that I was about to do something I would regret but it didn't stop me. I started kissing him and when I knew he wasn't going to stop me I began taking our clothes off. Before I even knew what was happening we were laying in the bed, completely naked. I had him on his back and slowly climbed on top of him, never taking my eyes from his. By the time we were finally finishing I had started sobering up and the guilt was coming fast. I didn't give him a chance to say a word, I climbed out of bed got dressed and walked out the door.

I didn't go looking for Finn, I honestly didn't care if he was still there I just wanted to go home. I made my way to my car, then back home without any problems. My problem came as soon as I opened the door and seen Finn sitting on the couch.

"Where have you been, I've been worried." Finn said actually seeming to care.

"Seriously? I was at the party." I shouted at him.

"I couldn't find you, someone said they thought they seen you leave." He told me.

"Oh no I didn't leave the party even though I should have." I hissed.

"What's the matter with you?" He asked concerned.

"You really have to ask that?" I yelled "What did you think I'd be ok with you sleeping with Raven again?"

Finn stopped in his tracks "Who told you that?"

I laughed "You going to try and deny it?"

"Clarke you know I wouldn't do anything to jeopardize what we have here, I made that mistake in the past but I thought we moved past that." He said softly.

"I thought we had to but Finn to move past something you have to stop doing it." I was livid.

"I didn't" He finally shouted back.

"You lying bastard… I saw you… With my own two eyes… No one told me shit…" As soon as the words left my mouth I saw Finn's attitude completely change.

"Clarke I'm sorry, I don't know how I let it happen. It didn't mean anything." He pleaded with me.

"Oh don't worry about it you weren't the only one who got lucky tonight." I said before turning and heading for the bedroom.

I heard Finn follow me in "What do you mean? What did you do?"

I smiled "I finally decided to take a page from the Finn Collins books and I have to say it felt great."

Finn face told it all, he never expected something like this from me. I had been his since I was 16 years old, he had been the love of my life. I gave him every bit of myself and until tonight he was the only one I had ever been intimate with.

"Who" He yelled "Who the hell did you sleep with?"

That would be an easy question to answer. "I have no idea."