What should I do? (GIRLS ONLY) 10 POINTS?

Theres this girl that I think I love. She's one of my best friends and I've known her for a while. I wanna be with her but shes got a boyfriend :( it hasn't affected our relationship at all. She's wonderful and she's all I think about but it's torture cuz I just wanna tell her I love her and kiss her and never let her go, but nothins gonna happen with her fool in my way. So should I wait til they're done, should I get a girl while I'm waitin, should I move on(just thought I'd humor myself)? See I could wait but what if they don't get done? All that time and thought wasted. Then again I could try to get a girl til they're done, but wouldn't that be deceptive to the girl I was with and what if she falls in love with me? And I'm likely not gonna move on because this girl means sooo much to me and Ive tried but my heart won't let me soo yea. I could also tell her how I feel, but that could get me shot down and even ruin our friendship. So what should I do? I mean I'm pretty much f*cked but which way do you think I'd be less f*cked. Thanks for the help!!