At the beginning a family is made of two parents. When only one parent takes such dramatic decisions as to lie to their spouse in order to hide its cheating under the umbrella "its for the best of the family", then I stand to my point of view: this person is acting badly (shortcuted to "a bad person").

And I can understand specific contextes, so don't come up with things like "what if the other is handicapped".

But it's ok, you place value in peace of mind, I place value in respect, different points of view, nothing new, no big deal.

I don't believe in happy relationships based on lies. The deception will always affect the relationship.

- If someone wants to believe the lies, then in order to avoid discovering the truth, they will keep the relationship intentionally superficial.

- If someone doesn't want to believe the lies, they will discover the truth sooner or later and they will just be acting through life.

Ask the wife whether she'd prefer to know, then decide whether the alternative is preferable. And besides that, other alternatives exist too. Marriage counseling is a thing.

Yes, hypocrisy is one of the worst things that you can to yourself and others.