This one guy I used to like and we went on a couple dates for a bit is really getting on my nerves lately. He thinks he is just the hotest guy ever and that he can get any girl, and to prove this he makes bets with random people that he can get with any girl, and I found out eh made out with one of my best friends. Grrr... he doesn't realize but a lot of girls in my grade think he is such a jerk, yet they all flirt with him like crayzy. How can I teach this guy who used me to to get with me, as well as other girls to, and show him that he can't play around like that! Its sickening

Your best bet is to just ignore him and any of his antics. Obviously he feeds off the attention of others, and any attempt to ostracize him will only further feed his egomanical personality.

Although it is difficult, letting this situation go by the wayside is the more appropriate and responsible thing to do.