Need help for a broken heart?

ok well im going to tell you my story...im a guy that doesnet do anything wrong nothing wrong to his girlfriend. well me and my ex where happy togeether but then an accident happened with one of my friends that he kissed my girlfriend and now we dont talk. i was so happy in love that i let go of the fact that he kissed her and we kept on wih our realtionship. but ever since then i've been overprotected not by the fat that she talks to guys but the fact that she only has guy ffriends. so then one day she sells me out for her friend and i break up with her. i break up with her constantly and then one day she doesent want to get back with me. i told her i changed but she doesent want to take me back. i call and call tct and everything but she is always with other guys. i dnt kno what to do i want to kno if i should get over her for the fact that she doesent care that we dont talk. she could care less if i have another girlfriend. i really need help how to get over her or what to do