Im in love..but he has a girlfriend... i feel like im dying! help!?

Im So madly inlove with this guy in my grade...i know that its probably not love because im only in highschool, but i feel sick when i see his girlfriend around. i know that being in-love with a non-single guy isnt exactly great. im not a stupid slutty girl like the other girls in my cl. We hug sometimes cuz hes a major flirt. and we tell eachother that we love eachother...except i know that he sais it as a flirty joke, but im not kidding about it :( i feel like im dying....his girlfriend has no personality...people even say that we would look cute together. practically every guy in my grade hits on me, i guess im popular cuz im the new british girl at my school, my accent helps too :P. i need advice, i want them to break up, but i also am not a tramp, i dont wanna be the kinda girl who splits up couples.. HELP!! thanks a ton!! xx