How can i get over him?

me and my boyfriend were together eleven and a half months, everything was fine at first, i am fifteen, he started getting violent and bust my lip and his friends witnessed this but he said it was a one off thing when really every time i did something in the slightest taht wound him up he would lash out but i didnt have the heart to let him go no matter how much i knew it was wrong, we had our own book together that we both wrote ina about each memory and we had somany memories together it was really untrue/: we spent loads of time together when not with friends, he asked m,e to have a baby with him, we tried but on valentines this year he ended it, i was distraught, it actually broke my heart, i tried to convince him things would change but he woldnt believe me, i didnt do anything wrong, and i certainly dont u8nderstand what i could have done which was so bad to make him want to end it pn valentines day, it was two weeks before our year date/: and then, he got with w new girlthe same day which i pnly found out from fb, since weve broke up which is nealy fove munth ago he has kissed me three times and i ahvent rejected him, we also had once and each and evry time he tells me he loces me but then comes back and says he regretted it and allthis stuff about how much he hates me, i dont understand, one minute he says we can be friends, next minute he doest want to meet me, he messes me about all the time and whenever i am near to having a chance withj soemone else he truins it, whyy? the worst thing is, i still cannot get over him and it kills me to think of him getting with sopmeone else because him and that other girl only lasted a week so its notas bad and i dunno what id do to be honet because like i still love hiom and really thought he was teh one, what can i do/:?