Dan: If you can't tell the difference between what I did to Blair and what I did to you, then maybe your portrayal in the book is more accurate than you thought.
Serena: That sounds exactly like something Dylan Hunter would say.

Dan: I'm sorry you're not hurt.
Serena: No, not hurt. Mystified. In high school, you were the only one who saw me for who I really was. Or who I wanted to be. You helped me be somebody that I was more proud of.
Dan: I didn't know.

Chuck: You're making a big mistake.
Louis: In thinking that Blair could be trusted? Yes. She will always have her secrets. She can't exist without them/ You were right after all.
Chuck: You shouldn't listen to me. If you read Dan's book you know how I turn out. You have a chance at having love in your life. Not ending up alone, hanging in a closet. Don't give up. Or your own fact will be someone else's fiction.

Blair: You'd better hope I can stop your fantasy life from destroying my real one.
Dan: Blair, I never wanted us to come between you too.
Blair: When are you going to get it through your head? There's no us! There never was. There's nothing here but friendship, and even that's gone now.

Serena: Is this what you've been trying to tell me all day?
Blair: No, because it never happened. {to Louis} It never happened!
Louis: I don't believe a word you say! You said yourself that Dan has no imagination.
Dan: Okay, thanks. But Louis, it didn't happen.

Looks like the best piece of fiction is that people are actually happy for Dan Humphrey.

Serena: I could lose my job over this.
Blair: I could lose my fiancée.
Serena: What?

Serena: Hey, do you know where Dan is? Can you believe what he wrote about me?
Chuck: Which part? Sabrina is glamorous, sexy, beautiful.
Serena: Selfish, insensitive, shallow.
Chuck: I can tell you from experience, everyone loves a villain.
Serena: Yeah, I told Blair the same thing. But then I realized if that's true, why are you always alone?
Blair: Not one word! Have you seen Dan?
Serena: No, have you?
Both: Did you see what he wrote me?!
Serena: No, I didn't have time to read all of it. Just the parts about me.
Blair: Me too.
Chuck: Check the study.

Don't bother lying. Or hanging up. We met this morning when you were Charlie Rhodes.

Diana

"Flighty"? "Irresponsible?" I'm gonna kill him.

Serena

Can we dare believe? Queen B and Lonely Boy doing the deed? Even I have to admit, it's a novel idea.

Chuck: You spend extra time doing your hair tonight, Nathaniel?
Nate: Ha ha. I don't mind that Dan made me gay.
Chuck: No, I was actually a little offended he didn't make me gay. Personally I thought you'd be more annoyed being conflated with Eric.

Gossip Girl Season 5 Quotes

Dan: It's Blair's Save the Date.
Rufus: You're not happy. You guys are still friends, right?
Dan: Yeah. Friends. I wonder if she invited Chuck.
Rufus: If he's anywhere that FedEx can reach.

Dan: Dad! What are you doing here? I thought you'd still be in London helping Jenny set up St. Martin's.
Rufus: She and Eric kicked me out when I didn't know who Sierra Burton was, so I came back here early and thought I'd spend some time with you.