MARK: So, how are you and Derek?
MEREDITH: Excuse me?
MARK: You guys back together or what?
MEREDITH: Why do you care?
MARK: He’s my best-friend, I care about him.
MEREDITH: Well, that wasn’t so obvious when you slept with his wife.
MARK: Ouch. You’re feisty. I like feisty.
GREY’S ANATOMY | S3 Deleted Scenes