I'm in Love with my best friend, But.?

Well... I met her in 6th grade when her freind asked me out for her. and.. come 7th grade, i left the school. and we broke up. and we kept in contact. But come 9th grade. i came back to the school, and she was dating some guy... who i am freinds with now, but come 10th grade. she wound up dating a senior... and somehow.. her freind (female) figured out i liked her. and told her senior bf. and he told her.. and she told me.. that she had felt the same way. and wished i had asked her out inbetween bfs.. and i wanted to, but never could bring myself to do it. cuz i never thought she liked me. but now... shes dating this senior.. who.. OBVIOUSLY... has plans.. if u know what i mean.. i really hate him for it... dont get me wrong.. i've had . but i wud never like.. push that idea on her. cuz.. shes really.. wait til ur married. and i admire that. but everytime i see some tv show.. or sappy song.. ect.. i think of her.. and it puts me in tears practiclly. because.. shes now going to prom with him.. and... she loves him.. and all that.. and.. i just wish we had realized how we felt about eachother, b4 she met this senior.. (she doesnt know i love her.. she thinks i never stopped like liking her..... which is how she feels about me).. i dont know weither.. I should give up? or.. idk.. and im not going to break them up.. im not that kinda person... i just.. think the only way her and i could ever have a chance again, would be if they broke up.. and thats uming.. i could muster the courage to risk our freindship on possibly the best thing that could EVER.. happen to me... cuz.. she makes me happy when we talk.. and whatnot.. u know? but it simply kills me a little inside.. every time something reminds me of her.. and its not.. nerd boy, loves hot best freind.. i have options.. but i always end up back thinking about her... i just.. dunno what to do.. the last i will see her until i can drive (in 2weeks... legally.. uming.. we cud hang out) is.. a little bit after her school.. on mondays.. and.. i just.. im so confused.. idk what im supposed to do.. cuz.. i cud tell her i love her.. and it wud have negative effects between her and her bf.. and i dont want to be the cause of that... im just going to shut up now... advice... please?