Did I overreact? Gets anger out on me

My boyfriend and I soon are going to be 5 months and already have gone through a lot of fights. That says a lot. We always seem to argue and according to him I am at fault. Whenever it does not go his way or I dont say what he wants he lashes out at me. Yesterday our teams played and he kept betting a lot of money with people. I let him know it was high likely chance he might lose since my team wins everyone they play against his team to please stop betting money. He told me "fuck off. If you don't support my team fuck you. I don't need you telling me constantly my team is going to lose" more things were said to me and thats where I had it and said "I never want to see you again! I am tired of you treating me this way!" He messaged me after I hung up asking why I am always going against him and explaining why he went off on me. Its obvious I am from the contrary team and I needed him to stop betting $. I've been bottling up my feelings so much I exploded and finally told him (through msg) how I am tired how he treats me, takes advantage of me, my love is not reciprocated, and how he is always saying its so easy for him to get sex elsewhere if he wanted. He responded "I dont need your drama." And other things telling me how I was wrong for not supporting him in his bets. I never responded back...

This guy always goes off at me for the smallest reason. Yesterday he said he was going through a lot and didn't need me( my negative energy") in his life. He has left me multiple times and that is what he always says. He has been acting extremely different these days.. normally we call each other nicknames and are sweet with each other. He has been distant. Even the sex is different, less emotion. A couple a nights ago after some drinks I told him I've been thinking about breaking up but haven't really thought about it through. He laughed and said "you leave me? You could never. You love me too much"

I was so deeply blinded over this guy I had refused to see how much hurt I was causing myself.