Serena: Everything you've done, spreading rumors about who I've had sex with, what alley I puked in or telling Dean Barrowby that I killed Pete Fairman, I forgave everything all because I thought one day you'd grow up. But putting up a Gossip Girl blast about Yale and the press release ...
Blair: Serena, I didn't put out the blast.
Serena: At least have the dignity not to lie to my face.
Blair: But I'm not lying.
Serena: Only two people knew about it, you and Dan. And Dan would never do something like that. I always want to believe the best in you, Blair, but the bottom line is, betrayal's in your nature.