Hi, I'd like to help you with your question.
It sounds like your boyfriend has taken the loss of his marriage all those years ago and put his loneliness and grief from it into his relationship with his daughter. She has become the center of his world and everything else is second.
Whatever your boyfriend is like now, before you get married, is going to be what he is like after you are married. Marriage does not change a person. The only thing that changes someone is the person themselves. So if your boyfriend sees no problem having that kind of relationship with his daughter, then he has no reason to change it.
You can suggest to him that you both go to therapy together and see if he is willing. He may be willing to hear someone else tell him that the relationship is not a normal one. However, if he was willing to give up the intensity of the relationship with his daughter, he would have to deal with the grief and loss he never dealt with when he lost his marriage. Whether or not he would be ok with that is up to him. Otherwise, you may want to rethink this relationship if you want to be first in someone's life.
I hope this has helped you,Kate
No I do not think so.