Considering your crush is taken, that is self-explanatory. Hold your head up and leave it be. Whatever is meant to be will happen just as it should, when it should.
I know a guy who had a crush on his best friend for year. He did everything she wanted, got her everything she desired, yet she was never interested in him as nothing more than a friend. He finally met a nice young lady who is as crazy about him as he is her and they just celebrated their 1 year relationship this past week.
So, don't fret about what you can't have. There's a reason for everything.
Blessings,
angelkiss