help me please.

help. i am 16 years old, my bf is 19 and i am in an abusive relationship. i have been with my boyfriend for 9 months. we fight everyday and im rarley happy anymore. i need to break up with him but if i do im scared he will kill himself. durring the 9 months we've been together he has been in the hospital 3 times for threating to kill himself. i was the one that had to make those phone calls. do you know what that does to a 16 year old!?? i am so scared that if i try to leave him he really will kill himself. please help me.