I realize that you're finished with her for good, but two quick things:
A huge warning sign should have popped into your brain after your first night with her.. she goes to "third base" with you on the very first night she meets you? Chances are if she does it with you, she's done it before and will do it again with other guys. I realize that all I have to go on is what you've said here, but if I came across this girl I would label her, for lack of a better word, a slut. Maybe I'm just weird for wanting someone who doesn't make out with every guy she meets?
Also, you guys seem to have gotten into a lot of fights, about not very important things. What is it about people that they can't let things go, or make compromises, or express their feelings without making the other person hurt and angry? If you can't talk about your concerns, then the relationship is doomed..