An Amazon reviewer makes this observation re the Chet and Bernie mysteries. The character quoted is Etta, the retired crime reporter in A Farewell to Arfs:

‘Plus — as usual — the author hits us with surprising insights into the human condition, like this one, concerning marital infidelity:
“The wife always knows. Completely different if it’s the husband getting cheated on. They never know. At the same time, when they’re not geting cheated on they can get very suspicious. That’s why the cuckold is comedy, and the betrayed wife is tragedy.”‘

(Digital sale on A Farewell to Arfs happening now – $2.99!)