The way I would have created the wife cheat path here is by allowing the husband to slam the brakes on their adventures while the wife decides to continue on her own. I thought there was a hint of that in the last update where the husband had the option to tell her that she's moving too fast with it. In this update they are always on the same page and she won't do anything unless he condones it. You could have had her doing those same things on her own. For example, the husband is asleep when the neighbor knocks on the door and she's in her towel or she's home alone when the food delivery guy comes or she takes a cab with another cab driver (not her husband), etc.