IGNORE IGNORE IGNORE! he wants what he can't have, and he can't have you, to him its probably just a big game! therefore he's lusting over you in hopes that he can eventually wear down your guard! Ignore his phonecalls, emails, msgs, texts and if you have to reply/talk (in person, called on blocked caller ID) keep your answers short, blunt and to the point (meaning, yes or no with no tone or enthusiasm in your voice). If you're nice, sweet, flirty (accidental or not, or maybe he thinks you're flirting/playing hard to get) then his infactuation will only grow stronger! Eventually he'll get the picture and back off if your blunt with him.