a few years ago i was in a similar situation with a girl i knew from university, we were rly close friends but i was just as dumb and also inexperienced. i fucked up, friendship break with her and some other close friend. we dated, i even slept with her but not more, it didn't work because too much shit happened. back then i had hard feelings for her, today i don't even know why anymore.
but i'm glad i took the risk even if it destroyed a friendship or more but now who cares, i learned a lot and helped me with other situations.
life goes on no matter what, really.