According to you she was/is dating a not so nice guy. You asked her if she loved you? she couldnt give you an answer <~~~ that does not mean she loves you. I don't know why you assumed that. If she loved you in a romantic way she would break it off with her boyfriend.

You are most likely comparing every person you date to her and the thoughts of love you have for her.

I would say it's time to move on. maybe you and her are only meant to be friends.