I thought I wasn't going to like this manga, but it is pretty good. I think once he tells them the truth they will probably be surprised or they already knew. Or they can get mad at him, but the way they love him, I don't think they will.
@ArcTicKronos Does he ever find out who the daughters...
He is probably going to hug her saying I am sorry, start crying, and then it is going to be a happy ending. Either walk away forgiven each other or they are going to become a couple.