What is that meant to mean?:/?

ok so i was in geog today and i was completely loning coz my friend was off school ill. so at the end of my lesson i was sitting on mychair waiting for the bell facing the other way, when this guy i like barely know walks past and touches my head so i turned round to see who it was and he smiled at me and i was like :S because he's also in my history cl and i think he's quite fit but we havent said many things to each other like face to face i mean we've said like 2 sentences and i dont fancy him i was just wondering what made him do that? and there's this guy i really like and i get jealous like everytime he talks to a girl. ive liked him for like ever and i really really dont want to like him anymore he's a jerk but i cant help felling jealous?! so whats that meant to mean and how do i get over this other guy aswell??! please help hating feeling confused and jealous at the same time :(