Long distance relationship

So I’ve been dating this guy for 5 months now. He lives in Brazil and I live here in the US. At first I thought we had so much in common, he both shared the same ideias and interests and we were very much in love with each other. Few weeks into the relationship I found out many things about him that kinda made me have second thoughts. He’s been trying to overcome an alcohol problem in which I wasn’t sure how to deal with, besides giving him all of my support. But other than that we became to argue almost every day. It goes from name calling to offending one another. He has a bad temper and it seems to me that he explodes about every single thing. I asked him so many times to try to change but he tells me it’s hard. Besides that he’s very controlling although I feel I do the same thing to him as well. I have tried to end the relationship many times but he says to me that he will commit suicide. Last weekend I tried to break off and he overdosed on alcohol and pills but thankfully I called a friend to check on him and he was brought to the hospital. I feel so trapped as he continue to tell me that if I leave he will end his life. I’m so overwhelmed with everything, and he doesn’t have any family that I could at least call and let them know.