M.F.
This situation is hard. I called my step dad Dad for 18 years. Now my Mom and Step Dad are divorced. If he was the type of man that you are with I would still call him Dad. I would still go and see him. That's another story but I think that if this man wants to step up and be your daughters daddy, I would let him. Take it slow like you are. Let things happen as they do. Maybe if the biological father won't step up and take his place in her life he could adopt her. I am adopted. I just met my real father two years ago. He is a good man. But growing up my Dad was still my Father as I saw it. I didn't wonder about my real father until I was grown. My Dad was all I knew. If he is willing to love her I would let him. As long as he is a good man he will always be Dad to her. This is just an opinion though. Go with your heart. Sometimes my mind gets in the way of my heart and I over think it. Do what you feel is right for her.