I've caught feelings for my best friend. ...again, we both are bisexual but she…

I've caught feelings for my best friend. ...again, we both are bisexual but she told me the only person she likes is her other friend and fictional characters. She used to hit me, insult me, and all that. She used to be my girlfriend it's been 3 years since she was my girlfriend, and now all of a sudden / want her back. She has been progressively getting better, she is nice, she never hurts me, she's always concerned for the bad things in my life, what do I do?