All me and my boyfriend do is argue

Alright this is gonna be long but, Me and my boyfriend Davontay have been talking since then end of april and started dating some point in may. Everthing between us was always great. We both knew nearly everything about each other. we used to spend everyday of every minute on the phone, whenever we would meet up we would be kissing, play fighting, laughing, just have pure fun. Im 14 and he is 15 going on 16. My parents found messages between me and him they didnt like so my phone got taken away. Since then I've spoken to him on and off, i used my iPad to message him on snapchat, one day we were on facetime and he said i was getting fat. Thats where it started. I got angry and hung up the phone and he is so stubborn he didn't wanna apologise. The next day we were on FaceTime he said to me I'm only with you for your looks so i sad I'm only with you for the money as a joke but he got really angry. Ever since then whenever we speak we argue. All he does is call me dumb a cunt, once he threatened to beat me up, but i know he never will and he was saying all this infant of his friends.He claims he loves and misses me but doesn't act like he wants to be with me. We broke up but then within 10 minutes we some how ended up back together. All he does is either ignore my messages or argue with me. Of course i do a lot to probably irritate him but when ever i say to him in the middle of an argument why are we still together then, he acts like I'm dumb for asking. He blames it on us not being able to see each other often but right now I'm grounded because of this relationship. I do love him, its probably puppy love, but its my first love. Everything good about this relationship out ways the bad. I fell like we are just going through tough times. But like i said, whenever i message to resolve things we just argue and he doesn't answer my calls and when he does reply to my messages its always at times like 7 or 9 so eventually he says he's tired and just ignores me. How should i fix this....