And if Monica used Descartes' method of doubt, she would have withheld her judgment about whether Pat was cheating in the first place, because she did have possible reasons to doubt that that belief was true.
Or Emma Thompson in this scene from Love Actually, where she plays a woman who just found out her husband is cheating on her, but tries to maintain her composure for the sake of the family.
When Zeus' wife Hera learned that he'd been unfaithful yet again and that Semele was pregnant, she tricked Zeus into revealing himself to Semele in his divine form.
There were accidents to machinery, the liability of trains to run off the line, collisions, bad weather, the blocking up by snow—were not all these against Phileas Fogg?