Help, my girlfriend cheated on me!?

So i had been going out with her for three months. I really liked her (and still do). We hadnt had sex cause were only 13 and even though all my Crip friends have, i havent. But i guess she was dissapointed or something cause she made out with someone who i dont know. She told me later that night on the phone before asking him out. Next time i saw her, she was wit him and i went over. He started insulting me and i bunched him and possibly broke his jaw. two or three weeks later (now) they break up cause he tried to have sex. My homie says she still likes me and wants to get back together, but i dont feel ready. I really like her and shes hot but i just cant really trust her.