IMO it is because the man thinks with logic and reason. He realizes that he will lose half his assets, pay child support/alimony and share custody of the kids. Those consequences most likely keep him from leaving his W. He may only be in the A for the sex and thrill anyways.
There was a poster on here who was obsessed with limerence and was 100% convinced that once that ended his w would return. It’s been 3 years and as far as I know his w is still with om.
M:51 W:46 T:22 M:16 S:15 D:11
“Don't chase people. Be yourself, do your own thing and work hard. The right people - the ones who really belong in your life - will come to you and stay.”- Will Smith