My dd said this at one point when she was younger, and I told her how much her dad loved her and all that and asked why she felt that way, and she said she doesn't love him the way she loves me. We talked about how we have different relationships with different people and can love people in different ways but still love them. I don't remember if she "got it" right away or if it took awhile, but anyway I guess the point is that love is a much more complicated concept to grasp than it appears on the surface. We can love different people and have different specific feelings but they can all be love. We can get angry with someone and feel angry and not feel loving at that moment yet still continue loving the person. There are lots of things about love that are hard for very young children to understand. I would worry more about how you dh handles it, that he understands that it's just a lack of understanding rather than a lack of love, because it could hurt him and he could respond in a way that makes things worse rather than better, and then just rest assured that she will mature and understand what love is and have a very special relationship with him.