If this was happening to me I would feel that he has not let go of something yet. I am not saying there is something but, this is what I would feel.
In my case Inpain brainwashing has come from his church. I used to attend there. The pastor is very dominant. It is not a cult but, because it is a small group he gets involved in their lives too much. When I attended there some of us were called into secret meetings and told who to talk to or not. If you leave that church you are not helped. Since I left that church I am not part of the circle. My husband changed over the years. Everytime I think of when it was better it is pre this church. I called his pastors for counseling I was told that they couldn't counsel with us and that my husband had gone on with his life.This is what they have put in his head. I didn't cheat or do anything else to warrant being told that he is not sure if he loves me or not. That he loves me with the love of the Lord.
Work on yourself . Keep your head up. For I always knew that my husband wanted a strong woman. I became too weak and consumed with depression. Let your husband see a strong woman not a doormat.