Hmmm. You know, it just occurred to me that after that "It used to be" Buffy could easily have been thinking:

Yeah. Right up until you got on my case when my boyfriend was going to vamp whores! Fuck you, Xander. Way to be a supportive friend. Why should I ever open up to you again?

I know I would have found it cathartic. ;-) But Buffy isn't one to call her friends on that stuff. I wish she would. It would make the making up part more meaningful, for one thing.