I am fairly new with these things, but a few ideas come to mind. The first is that, if you haven't read His Needs Her Needs, one of the needs that some people have to feel love towards their spouse is physical attraction. Are there things that your wife can do to make herself more attractive to you, (lose, or gain weight, shower every day, make up every day, etc?) These things are not shallow, they are serious, and if you can safely communicate this to your wife, and she is on board to making changes, then that may help. Another is, never hide your passion while you are ML! If you realize it in your head, allow it to come out and show it, even if it is just small steps.
