I have a girl problem pleasee helpp?

there this girl i have had past relationships with , we never went out but we talked , everytime she gets a boyfriend i like her so much i cant even explain , and she still likes me , but her and her bf are gunna break up and she wants to know if im gunna have feelings for her like i do know , and i dont know if im gunna like her as much, i want to like her , i just dont know what todo if i dont like her as much , can someone tell me what todo so i can have the same feelings i do now and be happy with herr