I've always gone to my friend for advice on this girl i had a crush on.Now i think im falling for my friend...?

well you like her probably because like you said she is beautiful, sweet, a close friend, and most importantly accepts you for who you are. the combination of these traits makes you fall for her; she seems like she is possibly bi-curious so maybe you guys should spend the night together and you can slowly make little moves on her. sit or lay really close to her enough to be touching, poke more, get close, and at night talk about personal things and see what happens, just dont be too forward. that will help you figure out how your friend feels. best of luck! :)