Contrary to the developer notes, on the cheat route, the wife character will still cheat even when player remained faithful and maintain high respect. Regardless of actual sex, she is already lying about meeting up with other men. I find this highly contrived and a flaw of having to choose the defined routes in the game. Then even with the evidence the game does not allow the player to cut ties, artificially locking them into NTR scenarios.
So I made a mod reusing the game assets to provide the choice to divorce when you are faithful on the cheat route. This will lead to a alternate ending made for the mod. As a bonus the mod will also provide a choice in the share route to skip the swing and get an alternate ending with just the both of them.
Mod Post:
Watching My Wife Alternate End