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Mark: Ever feel like you're gettin' old?
Derek: Meredith isn't telling Cristina about us. She tells Cristina everything.
Mark: I thought you broke that off!
Derek: I meant to.
Mark: You think she's gonna wanna get back together. You think she's gonna grow up, and get all whole, and want a relationship.
Derek: I do not.
Mark: [smiles] You're a bad liar.
Derek: [smiles] You're old.
Mark: I'm just getting started my friend.