Stopping your exercise regimen "for now" right after she decided not to leave is the worst thing you can show your wife. Your showing her that she has to leave you for you to get off your a$$ and do something for your marriage. Also, you're showing her that you don't care about exercising for yourself and that you're only doing it to keep her from leaving (covert contract) - NOT GENUINE. Don't be so lame.
A man who takes care of himself FOR HIMSELF is HOT to a woman. Until you get to that point, no one is going to want to seduce you. YOU have to make the first move, or your fate will never turn itself around. Put your ego aside and dive into the right mindset before it's too late.
I love food too much, too, but exercise has become more of a real friend. Treat it like a job, punch in at X time, punch out at X time. There is never a good reason not to exercise. If you can find time to eat, you can find time to sweat.