Meredith (laughs): Do I have sex hair?
Derek: If I did my job right.
Meredith: You go ahead, I'll wait a minute.
Derek: This isn't just break-up sex, this is secret break-up sex. Is this about Cristina, this morning in the elevator?
Meredith: Oh, no. I mean, I don't know what to do, we don't talk about it... the whole Burke thing. I mean, I wanna be a good friend, I wanna take care of her. But... you know, Cristina.
Derek: Okay, so by being with me you're cheating on Cristina.
Meredith: Just... if she knew about you and me...
Derek: You'd have to talk about, you'd have to talk about you and me. And that'd be a long conversation and there would be no time left for her to talk about her.
Meredith: I told you we don't talk about it.