Friendship Advice?-

I'm going to try and keep this short: I have this friend that can be amazing at times but can be really annoying and abusive at other times. What she calls wrestling i call violence. I want to take a break from hanging out with her but she says she gets lonely and she has an abusive dad then i feel guilty. i believe she gets her abusive side from dad but i dont understand why she lashes out on me when she says we're such good friends. i listen to all her problems, i take her out to eat from time to time, and let her meet some of my friends. she just isn't social and i dont think i can be her only friend, i have to live my life too... WHAT SHOULD I DO???
-I'm a guy and the friend is a girl