How do i get over my ex? PLEASE ANSWER!?

ok so April last year everything was great in my life, i was very happy, i had just turned 18, and as my friends would say i was a goody two shoes! i was still a virgin, didn't smoke, barely drank and was a very happy go lucky girl. in may i met this guy, we got together in June and where very happy together. pretty much as soon as we got together i started smoking, and drinking quite abit but soon cut back on the drinking. 3 weeks after we got together i stayed at hes place with my cousin coz my mums bf was staying at mums and i hated him, me and the guy slept in he's bed welst my cousin slept in the lounge, i ended up giving in and sleeping with him, after my cousin went home i just stayed there coz i didn't want to go home a few weeks later i officially moved in. After i moved in everything was going great i couldn't have asked for a more loving caring boyfriend, a few months later things started to get really rocky between the two of us and be decided we would take a break, i moved back to mums and we still seen each other every couple of days, one day he decided he didn't want anything to do with me and i was like ok fine whatever. he soon got into another relationship that he stayed in for about a month and a half and a few days before Christmas i get a random message saying " im sorry i done this to you i miss you, i need you i thought i didn't but i was wrong can you please come see me" so i went and seen him and said look i still love you but im not going to be second best its me or its her make up your mind coz im sick of waiting he decided he wanted to try and make us work so i started staying there again, Christmas day come along and he told me to go spend it with mum (as he and mum didn't get along) so i did, later that day i called him and the other chick answers the phone, i cracked and then he messages me later saying he was sorry and come and seen me, we sorted things out and made up and then i wanted to go back to hes house he said nah i want you to spend it with your mum i was like ok, later that night i seen him and this other chick walking towards hes house holding hands, me being furious went there and we had a fight, i was drunk and upset and ended up putting my foot threw one of hes windows and then had to go to hospital, a few days later i get another message saying sorry i cant hurt you anymore im going to tell her i never want to see her again, me being me fell for it and went back, this time things where going really well. we where happy again like what we where when we first got together! we where having sex almost every night then one day he changed again we where lucky to had sex once every 4-5 nights, he never wanted to be home with me, when he was home we would just fight until the point i would go and get into bed and make him sleep on the couch! then it started getting worse he started pinning me up against the bedroom wall tried to hit me a few times the only reason he didn't is because i would start crying then he would be like oh im sorry i didn't mean it and hug me until i calmed down and went to sleep. then one night i went down the street and come home when i got home he went off, tackled me to get the keys took the house keys off the keys and threw them at me, told me to **** off and never come back, i left. A week later i had to get the police to go get my things coz he wouldn't give them back and haven't spoken to him since, hes got a new gf but i still miss him and love him, how do i get over him, its driving me crazy i dont want to love him but i cant help it, i just dont know what to do!