I agree with Into the Woods is it this speech:
Xander: (to Anya) I've gotta say something, 'cause I don't think I've made it clear. I'm in love with you. Powerfully, painfully in love. The things you do, the way you think, the way you move... I get excited every time I'm about to see you. You make me feel like I've never felt before in my life. Like a man. I just thought you might wanna know.
Or it could be from the next episode Triangle when they are in bed together:
XANDER: You ever have that feeling where there's something you know you're supposed to do and you forgot what it was?
ANYA: Nope.
XANDER: I've been having that feeling, I just realized what it was. (looks at Anya) Like three weeks ago Riley asked me to borrow a crescent wrench. (shakes his head) I keep having this feeling like I'm supposed to give it to him.
ANYA: Well, that's not going to happen unless he comes back. You know, not to get the crescent wrench. Just to come back.
XANDER: I just mean, sometimes I sort of forget that he's gone. It's like, "where's Riley? Oh wait, the central republic of Where-in-the-hell."
ANYA: (softly) Xander?
ANYA: If you ever decide to go, I want a warning. You know, big flashing red lights, and-and-and one of those clocks that counts down like a bomb in a movie? And there's a whole bunch of, of colored wires, and I'm not sure which is the right one to cut, but I guess the green one, and then at the last second "No! The red one!" and then click, it stops with three-tenths of a second left, but then you don't leave. (pause) Like that, okay?
XANDER: Check. Big bomb clock. (She smiles) Come here.
ANYA: Maybe it's her.
XANDER: Huh?
ANYA: Well, maybe it won't happen to us because it's all about *her* messing things up. She couldn't make it work with Angel, and then she let Riley go away.
XANDER: Yeah, relationship debris is kind of piling up on the Buffy highway.
ANYA: Hmm. Humans make the same mistakes over and over. I saw it when I was a vengeance demon. Some guy dumps a girl, she calls me, I exact vengeance, blah blah blah, the next year, same girl, different guy. I mean, after you smite a few of 'em you start going "my goodness, young lady ... maybe you're doing something wrong here too."
XANDER: I don't think it's a pattern with her. No, it's just ... you know, now that it happened again ... man number two ... I wonder how she's dealing with it.
Hope this helps 😀