I agree wtih Mod_007. Keep in mind that an unanswered love is the worst thing can happen to u. A declined love is always better, because you know what you can expect the rest of the time you spend with her. I suggest you would just tell her ur feelings for her.
goodluck mate, love will always survive 
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I third this motion!
I have been in a similar relationship and let it pass me by. For along time after that I always blamed myself and tortured myself by dreaming of what could have been. Just tell her, the outcome may not be what you want but will be way better then spending your life wandering what if.
Jam it back in, in the dark.