you are not a therapist so don't even try to help her !

YOU CANNOT CHANGE A PERSON THEY ONLY CAN CHANGE THEMSELVES.

remember that for every person you meet.

you need to do what is best for you and only you. how about not being in a relationship? sounds like some co-dependent issues and you need help too because you are allowing yourself to be involved in this chaos. ask youself why? love is NOT FULL OF GAMES ,DEPRESSION AND VIOLENCE.
talk to your parents!!!!!! PLEASE!!!!!