I'm staring at her go

Crying out in vain

It's all my fault, all my fault

That she, the gentle lamb was slain

She's in her own little world

Barely, her heart's torn to shreds

Her life, written on tapestry

Is now in single threads

It's all my fault, all my fault

Why oh why

I'm old enough to know, should've let her go

Before the prophecy was foretold, before she would die

[Flashback]

Rose: I've been to the year 5 billion but this… no this is really seeing the future. You just leave us behind. Is that what you're going to do to me?
Doctor: No, not to you.

Rose: But Sarah Jane, you were that close to her once—you never even mention her! Why not?

Doctor: I don't age. I regenerate. But humans decay. You wither, and you die. Imagine watching that happen to someone you—

Rose: What, Doctor?
Doctor: You can spend the rest of your life with me, but I can't spend the rest of mine with you. I have to live on. Alone. That's the curse of the Time Lords.

Her heart, her soul is broken

I should've let her go

My next friend, next companion if I have one

I will force myself and never be that close

Donna: That friend of yours, what was her name?
Doctor: (almost broken tone of voice) Her name was Rose.