"If she yields, I shall, at least, have the satisfaction of finding my opinion of women justified, and not be imposed on by a foolish confidence that abuses most men." (18.104.22.168)
In the "Story of the Curious Impertinent," the dude named Anselmo decides that he wants to test how loyal his wife is to him. So he gets his handsome friend, Lothario, to hit on her. Of course, Anselmo assumes that only his wife could betray him. He never considers the possibility that his friend would snog his wife behind his back, because his friend is an honorable man. But by trusting men and not women, Anselmo seals his own fate, as Lothario starts seeing his wife behind his back.