Serena and Blair in “The Age of Dissonance”

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.