In some cases, the wife does not have an affair, she throws herself into business.
She takes on more responsibility, she advances, and may reach a point where not only doesn’t she need a husband, she doesn’t want one.
The woman who has grown children and is a lively forty plus might burst the glass ceiling because she no longer has anything to hold her down.
With extra time, she can take courses, she can work later, she can accept a position with endless responsibilities.
She can devote herself to her career, and often, this devotion pays.