Wayward: Turned or turning away from what is right or proper; willful; disobedient
I do not think an affair has to be present, in order to define a wayward. Waywardness begins in the heart. Resentment and disrespect may be shown in small or great degrees thoughout years of M, or maybe in a shorter period of time. Usually, some form of rebellion is displayed. It is not always an affair........but it's most common in what we see here.
If you don't want to believe the definition above fits your W, that's up to you. Considering she was the one who didn't want to work on the M and she was the one who stopped MC..........and the fact that she turned away from her H, her vows, home, and MR without there being some solid explanation for ending the M..........and she has bought her a condo........well, just saying...........she doesn't appear to be broken up about it.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!