Girls, what is wrong with this girl should i break it off?

maybe this girl has been with someone in the past and they ended up leaving her? she probably is just an emotional person if she's crying all the time. like with the whole punching you thing, she probably didn't mean to hurt u and when u were hurt it scared her into thinking that she's a violent person when she's not. i don't think u should end it but just be sure that you aren't leading her on. Just be sure that she knows you guys aren't exclusive. Maybe she just likes to hang out with you and that's why she wants to stay in touch.