"I may have poisoned her boyfriend. Possibly with the kind of poison that can only be cured with the blood of a slayer. So we may have had a fight that ended with her stabbing me and me falling off a roof and ending up in a coma for 8 months. And it may have been for the wannabe-a-demon guy. And by 'may' I mean definitely."
There may have been a little part of Faith that resented, even now, how casually Buffy had been prepared to feed her to Angel. And how none of the Scooby gang had had any problem with that. And people wondered why she had trust issues.