Psh. No matter the age, this scenario is familiar to all of us or maybe just the best of us. No need to judge.. Anyway, from a guys perspective, he used you and you let him use you. He doesn't deserve a second time around even if he wanted to because he, as what you stated "did horrible things" to you.. Not worth it and as hard as it may be, you just gotta let things be.
Ditch the guy girl! Ditch him there's someone better out there pumpkin.. TA is single.. Follow him he'll date you
simply forget about him...he seems like a douche and would you really want that guy back after he has been jumping from girl to girl? If he cared about you and your feelings he would have tried to work it out with you! As they always say "there is plenty more fish in the sea" move on to something better or enjoy the single life