I know a couple in rl where this sort of thing occurred.
I can say that the few that know the truth have more sympathy with the wife than the deceived husband.
The husband refused to go and see a dr when things weren't happening. At one point made a joke that his wife was the barren one in front of a load of people in a pub.
Refused to divorce her when she asked for a divorce because he didn't want her to get her hands on "his" money.
The business was 50/50 and started from scratch and she has her name all over it.
She met someone who was also married and they would meet up occasionally.
She got pregnant by him and passed the children off as her husband's.
Whether the husband believes her is anyone's guess. He had been so horrible to her reguarding not being able to get pregnant that i think he didnt like the idea of people thinking it was him who haf any problems.
As far as I know they are still together today. DC are grown up and they live completely separate lives.
So I can see it from another perspective and it is not black and white