I have just dealt with this problem recently, and I have found out the answer! you must be around him for awhile then, for no reason leave, just kind of avoid him. Show that you have a life, don't always pick up the phone when he calls and take awhile to call him back. Then, just when he's about to lose interest, (let's say 2 weeks) then be around again. It'll drive him crazy, because you know that "time makes the heart grow fonder". Then, compliment him all the time, build his ego up. Suggest things you want to do around him, such things like "I want to go see this movie, but I don't want to go by myself" hint around that you want to do stuff and if he likes you he might go with you. Do unexpected things, like dying your hair, changing up your look, style, this will excite him (not in a sexual way) and he will associate being excited with you.