Cursing Someone, PLEASE HELP!! Options

Ok so heres is the strory this guy that is way bigger than me is wanting to fight me im not a very big person and i have been passive for most of my life i hate fighting the reason he wants to fight is beacuse his girl broke up with him because he would abuse her and treat her like shit but know he is obbssed to the point he follows her and sits outside her house and wait for her to get home he tried to start stuff with me the other day but i ignored him best i could he has threatend to try and have me jumped and a bunch of other stuff but i was seriously considering taking a knife to school and if he tried something i planned on ending it but as you can imagine i really do not want to do this because i will be in loads of trouble. I have been involved in the occult for sometime now and i know about curses but not enough to perform one so i figured this would be a better alternative than seriously hurting him but i do not know a curse to perform or how it should be done any help would be great please im desperate this is a major problem for me right now.

Thank you all for the advice i was wanting to get a restraining order on him but alast i know this will not stop him he is truly a physco. He will not stop or he will get his buddies to jump me its already been discussed and im only 5'9 and not very big built and there all over 6 foot and are rednecks so there pretty well built not to insult anyone but they just have that appeal to them. I know that i am young and this will happen just because its drama of the high school type which i have always tried to avoide and hated yet ened up dead in the middle of it i really like this girl and its the only one that has acknowledged me for me and not something else. But i will see what happens hopefully it can be avoided but it seems inevitable :/.