buy him a copy of the book "the love dare". buy yourself a copy too! I'm just about done with it. I'm in a similar situation as you, although it's flipped. My wife is the one telling me her feelings are gone. She feels guilty and is not sure she wants to work on it or not. She's read the first couple of days in the book.
It really is a wonderful book and serves as a wonderful guide for couples. If your husband is willing to to do it; it will change your marriage. I say that because having completed it myself, I feel so much closer to the Lord; and I love my wife in ways I didn't know were possible. It's beautiful, yet that much more painful; as she cannot/ willnot return my love for her. But then, that's what true "unconditional" love is (Jesus style); it's my willingness to love her even if it's not returned.
The book covers some great concepts. First off, you cannot make him love you. He needs to "choose" to do so. The good news is that he can if he wants to. But he has to try. If he is willing to try, then he can put his committment into it, and his heart is bound to follow. Our Lord designed for us to lead our hearts, not to follow them. And it's really a beautiful thing; when you see the blueprint for marriage.
He designed it so that we will selflessly love each other, choosing to meet each other's needs, even if it isn't reciprocated. If both spouses are will to love in this manner, then love will never fade as you're constantly leading your hearts toward the other; and your needs will always be met.
The Lord is wonderful
I'll keep you in prayer. Please read my thread as well, and pray for my wife. Thanks.