Im a girl and i think im bi. Im falling for my friend which is a girl as well. And Im confused what to do:(?

Well, we've known each other since grade 4 and I got attracted to her when we were in highschool but my attraction to her didn't last. Coz we don't go out that much since 2nd yr to 4th yr. But now that were College students we go out once in a while but were in group, f0r this year It seems like Im falling f0r her since we go out like 3-4 times a week, and giving me favors like accompanied me to school for enrollment, then we watch movies at my house, we enjoy eachothers company, and take note! just the two of us. And i get this weird feeling that she would like to try dating girls/bi/lesbians since we have the same thoughts about Boys. I like boys but f0r now, I like her. And Im confused or scared what will happen if maybe I'll confess or just go with the flow. Im scared that one day, I'll be so inlove that I may do stupid things and will ruin our friendship =( . I do hope there are lots of people who can relate and could give me some advice or opinions that can help me (=