I was in a similar situation a couple of years ago, me and a friend got very close. Loads of texts, usually initiated by her...if i wouldnt reply within 10mins I'd get another asking if i was "ignoring her today?". Got many invites to go over to hers which is a 2hour drive each way. After a few months urming and arring, i finally told her i had feelings of more than friendship for her. It went badly, she wasn't interested in anything more than friends and then reassured me that my confession wouldn't harm our friendship.
We had a trip to London already planned so we went there with a couple of mutual friends. I think i got 10 words out of her all day. We don't talk or see each other anymore.
Gutted at the time, took me quite a while to get over it. I'm glad i told her how i felt, i'm not sure how i would've felt if i'd never told her and see her hook up with another guy. It was such a great weight lifted off my shoulders, although rejection is never nice.
Good luck mate.