Cutter help plz?

ok i asked this beofre and barely got any help. so im asking it again. my bestie is a cutter and he is emo (which gives me a bed rep cuz im emo) i dont cut myself and i have alot more pain. but i do have needles stuck into me like every week. his parents are divorced and he lives and fights with his dad alot. he is jewish. and i met him 2 weeks ago and we becames besties in like 5 minutes. he showed the scars and i felt thi pian shoot through me. it hurt. then the next day he comes to school with new ones and shows them to me. i felt another shoot of pian, i dont know why i feel thus everytime. but how can i help him stop cutting. he isnt talking to me much anymore. but i havent realy been talking to him. he doesnt have many friends and i know why he is cutting. i just dont kow what to do. i really want to help him cuz i reayll care for him. so plz give me some ways to help him. (and dont say tell someone cuz i know he will hate me for that and i dont want to do that anyway) thanks.