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Blair: I can't believe he told her you guys were going to do it.
Serena: Well, I told you.
Blair: That's different, I'm a girl.
Serena: Yeah, well, so is she.
Blair: Exactly my point. But even if she wasn't, when you get a boyfriend, you become the best friend and the best friend becomes the second best friend. That's just how it has to be, if it's ever going to work.