OK fan, take a few deep breaths...
Fae has done a lot of things, but few (if any) could be described as terrible. Ill tempered at times (aren't we all?), but I'd scacely call her cruel or thoughtless (at least, not intentionally so).
I'm not sure what you're referring to, but I can imagine the occasional pounding and nipple tweak she gave Marten in the early days are part of it. Much like the primary school mating dances that take place on any playground. Faye was stuck in a very bad place and working through it as best she cold (which was arguably not very well). In the 500-510 strips we found out why, and why she was (again, uniintentionally) stringing Marten along. She was attracted to him, would've wanted it to go further, but couldn't. And she (eventually) let him know what was going on. Then got help. And is now getting better. In every sense of the word. Yes, she knocked him down when he made that drunken pass, but that was necessary (self defense, look at her stance), and for how drunk he was, all she probably did was push him over.
As for her yelling at Sven in 854, that was prompted by other occurences, not by Sven, and while she clearly hadn't thought it out from his point of view, she was a bit stressed at the time!
As Jeph has said, and Faye just s easily easily could, "Clearly I have made some bad decisions". As someone else said, "Let he who is without sin, cast the first stone."
I can empathize with Faye. Hell, with most of the cast. I'm still not sure if it's a gift or a curse!