Sorry but both people in a marriage owe it to each other to stay in reasonable shape. Not supermodel shape but reasonable shape.
My wife is about 5’1” and when we met she was about 112 pounds. Not bone thin but in good shape. 37 years later she is at least 260 pounds. I have tried offering suggestions, offered to walk with her every day etc. All that she does is make excuses not to exercise ANY. I love her and I’ll never leave her but attraction has pretty much much died. I don’t want anyone else. I want her to just get to a reasonable weight level.