Well...he started out a great guy. He was nice in the beginning, but he kinda turned into a jerk (my mom's words)
someone told me to tell him to stop talking to me and leave me alone. if he doesn't walk away, then I am supposed to speak loud enough for people around us to hear, say something like "I've told you again and again that I don't want to be your friend or to talk to you, now leave me alone"
they said that he will be embarrassed by the other people seeing him rejected and leave me alone. I think that will work, at least for a day.
If he comes back again I might contact the campus security...it is a last resort though...
I'll let you know how it works out.