I was exactly in the same situation as you till 3 days back...and i sorted it out on saturday!!!..yeah just day b4...
she said that she has never thought of me like that...and that hurts but i am still glad that i managed to sort it out. this was the first time i was in love with someone and i am really sad...but i am sure i will never lose her as my best friend.
i think u shud just go ahead and tell her evthg...if u r really good friends...nothing can come between your friendship!
and whatever the result is...take it with grace...if she says YES...enjoy...if no...treasure her friendship and start looking...just realized yesterday that there are a loooot of pretty gals in the world!
cheers brother.
best of luck.