Hey, if you were sleeping with Rose, I could understand why you...
Mark: Hey, if you were sleeping with Rose, I could understand why you're spending time with her, but you're not. And it's... it's just I thought that uh... you know. I thought it was just gonna be you and me!
Derek: Having sex?
Mark: After! After Addison, after Meredith. I have been patient. I have waited when you partnered up with these chicks, but now they're over. And it's supposed to be just us! You and me; two guys on the prowl, on the hunt.
Derek: You're having trouble getting laid. And you need my help.