Girlfriend Help Please !!!!HELP!?

me and my girlfreind met at school first saw each other and then we went out it was like love at first sight at the start it was about ruff for a few months break up a few time every time we broke up she fall for one of my friend i no that sounds bad but she is really nice and a good girl she has alot of problems at home and stuff and like stuff but we dated for like 6 months after the last break up but like the other week she dumped me twice in under a week and moved school becuase of "parents" then were dating again but she likes this other guy she says that she only likes him and feelin will fade and she is really sorry about it and crys alot of it and we went to the plaza today and we held each other and we both fetl safe and that it was right again but i just dunno i neec adivce what do yous think about it ?? :? people say she is a slut and to dump her but they dont no her like i do :(