Please listen to my story?

i recently had a formal, the formal was great at the start and at the end the start i was sucking in helium and talking in a funny voice D the end was when the girl i liked made me dance, but the one bad thing, i cant stop thinking about her, she makes me regret the formal so much, i regret not going to the photo booth with her, at the moment i would give anything to go back and change what i did and have as much fun as i could. on facebook i look at photos everyone else has of the formal at the photo booth and i feel so bad for not going to it with that girl, now the only way to ease that pain of regret is close to nothing except getting close to that girl, she has a boyfriend but she has had like 2 others before, chance of breakup? i wish i hadn't been so dumb and not danced from the start i wish i went to the photo booth. i really needed someone to tell my problems to. i wish i was her friend. i talk to her and all but i still don't feel like friends though we say we are, i feel like something is missing. also will there be another formal, i feel my once in a lifetime year 10 formal just slipped away and i let it go so easily i want it back so bad and i want to be closer to the girl. so to narrow it down to. any chance whatsoever of a formal? how do i become better friends with this girl?