Persecution.......?

There's this GUY who's in my cl N he's weird cuz he allways talks about DEATH N stuff N everyone thinks he's weird so he has no friends @ all, but one day I started talking 2 him cuz I felt a lil' sorry 4 him,@ first he seemed like a nice guy,but now he's asking these WEIRD questions like: "R U A VIRGIN?" N one time he FOLLOWED ME HOME!!!! I keep tellng him 2 leave me alone , but he won't, I allready talked 2 the teachers about it N they didn't do a ******' THING!!!! what can I Do?????