I am easily get angry and upset with my gf and she left me

She left me one month ago. We are still in contact sometime. She said she does not believe me anymore (she does not believe that I can control my temper).
When I getting upset and angry, I start blaming her for whatever reasons or her minor mistakes. I know is my fault and I just could not control myself.
I really want my girl back. We have been dating for one and half a year, long distance relationship. We both loved each other very much. I think I have been hurting her so much, and she does not want to take me back...
Please help me...