Help! I don’t know what to do

So I’m in eighth grade and I used to sit next to this boy in social studies. Well he would always grab my thighs and move his hand in places that his hand shouldn’t be in. I’ve told my boyfriend about it and I’ve also told teachers and my school guidance counselor. Since he’s been removed from the seat next to me he’s kind of stopped but he still does it. I tell him to stop every time and usually one of my guy friends are normally there and they’ll yell at him if he doesn’t stop even after I ask. I just don’t know what to do anymore. I don’t believe it’s the clothes I am wearing because I always wear jeans and it’s not like I look good in them (my opinion) but I need advice on what else I should do because I’ve tried everything. He’s doing this to multiple other girls so it’s not just me who has this same experience. Help