Buffy: Are you jealous?
Angel: Of Xander? Please. He's just a kid.
Buffy: Is it 'cause I danced with him?
Angel: 'Danced with' is a pretty loose term. 'Mated with' might be a little closer --
Buffy: Don't you think you're being a little unfair? It was one little dance, which I only did to make you crazy, by the way. Behold my success.
Angel: I am not jealous.
Buffy: You're not jealous? What, vampires don't get jealous?
Ep: Some Assembly Required