How do i get over him..?

ok, well theres this boy and i started talking to him and he wanted us to fall in love he told me i was the girl and he felt right with me.. but we always got into fights but one of our fights were so bad it ended it and he told me that he would ruin my life in school. now he has a nother girl that i absolutley hate. but he still to this day always looks at me through the corner of his eye.. &gives dirty looks to other boys i walkk with in the hallway.. what should i do!