I am having an issue with my boyfriend

I don’t know what to do because I’ve known this boy since I was little. We started going out. When I came home from court one day he cslled me and started cursing me out because some girl that really likes him wants to be with him is always around him and I get that feeling that he is going to do stuff with her. So one day I was down philly and some girl interduced me to people the girl that interduced me said that she knows me from when I was younger I didn’t remember her but the girl that likes my boyfriend I thought her name was mary because when the girl that interduced me to them she said mary and the girl waved to me. So one day I called the girl that said that she knew me and the girl mary text me back I said oh I don’t like you because you like my boyfriend so we started fighting over the phone and than I called her and she wasn’t the girl I said sorry and that it was a mistake for what I had said. She said that it was okay. So than one day my boyfriend was doen philly and the girl told him that I cslled her and cursed her out on the phone. He called me and started smapping on me I told him what had happend and he said that he didn’t care and that we csn’t be 2gether anymore. I said whatever and that I love him but I can’t make his choices 4 him so we were done no more. Well I’m friends with his sister and I called her and he started talking about me saying that he never went out with me, that I was a B$%$% and that he never liked me from the start. Well after that the next day I called his sister again and he got on the phone and said that he never ment what he said and that he was just mad that zi would do that when he knows that he would never cheat on me. Well I took him back because he said that he really loved me and that what he said was all out of anger. I just don’t know what to do he is 15 and I am 17 about to be 18 in october. what should I do???

 remember we have been going out off and on since we were little