He's gonna fall for it again. It may just be harder for the spys to pull it off.
It might actually sustain civilized communication and behaviour, e.g a small lie to not hurt someone’s feelings.
Of course this level of deception in a marriage is worse, but it’s naive to think anyone is entirely honest.
This a known attack vectors that global security teams and front of house security teams go over yearly with C suite.
Not because he had an affair (who cares, really, and hardly uncommon), but because he had an affair that endangered the company, and in some respects our country.
Functionally, it's not different from "left an unlocked phone at a bar". A mistake anyone could make, but, when you're paid what he's paid, that type of mistake is the thing you're paid not to make.