Dude is into fitness and still dated/married someone who was already obese  Even aside from aesthetics, the general day to day realities of that is just baffling. I mean it's already kind of an uneven match when someone really into some form of exercise dates someone who's not. Differences in energy level, walking speed, endurance and any number of other things can make it rough. But push that into someone who's overweight or even obese? It's crazy trying to imagine that as anything other than a constant chain of annoyance where the other person is just so slow, tired and lazy that you can't do anything with them.