What should I do about this girl?

Wow, you seem like a really nice guy. And it is VERY hard to find guys like you out there, so don't change. Okay down to buisness. You might want to first figure out if you want to friends or if you want to be her boyfriend. After that, you need to see if this is a good relationship for you (either way). You don't need someone that is moody and gets pissed off so easily. You probably do need to take a break, just to figure it all out. Then, if you have a thought on it. Slowly figure how she feels about you. Ask her little nonchalant questions. But if she doesn't seem good enough to see what a great person you are (from what I can tell by reading this) then don't worry. Some damsel will need you elsewhere. :-D