I try to ignore it..but i have the urge to cry?

ok well this one kid in my cl is kinda always mean to evrything i say. like the othr day i was crying and he was making fun of me.. hes always doing this too.. in l.a he's rly mean and just keeps doing this evry day. these 2 boys kinda stand up for me tho. but.. yeah. but the thing thts making me cry a lot is my ex. hes nvr leaving me alone. he annoys me and like humps my desk... hes werid.. and hes always so mean to me he just stares at me and laughs then hes always talking about me behind my back. and sometimes i just cant take all this stuff.:P so is there anyway to make them stop.. or like wht sud i do? (btw i told on my ex once for making my cry and it didnt turn out to well..)