Girls want me BUT I HAVE A GIRLFREND!!?

i have a girlfrend we havent been goin out for to long but right when i saw her i just couldnt stop thinking about her.......i really love her....but shes scared of me cheating on her....i have summer school and the schools far away from my house so i have a bus..and theres was this one girl that sat next to me (REALLY HOT) and was mumbiling to her freid next to her and her freind pushed her on top of me (she over reacted) and her things were in my face and was touching herself smiling and said sorry messing with her hair ....every day she tries to sit next to me and i move away.....ALSO while i was in lunch these 2 girls went up to me and said "my freind likes you" and i was like ummm ok they grabbed me and dragged me to the girl (REALLY HOT ALSO) and told me to sit next to her and i just walked away.... they bother me everyday now about her.. AND ANOTHER THING IS EVERYTIME IM WALKIN IN THE HALL GIRLS TOUCH MY HAIR (even though its awsome lol) i really love my girl freind and im never goin to break up with her i just wish the other girls could stop (I EVEN TOLD THEM I HAD A GF) so my girlfreind could trust me!! But i do have to tell my girlfred about wat happenes cuz she asks me everyday after skool wat happened today did anyone hit on u lol i dnt wana lie tho. what should i do?