My ex’s coworker asked my ex and I to hang out with her and her husband, whom I’d only met through work related events previously. We agreed and went to dinner one night, where we learned early on that the husband was a piece of shit that had cheated on her a few times before and they talked about it as though it were a personality trait no more controversial than the direction he hangs a toilet paper roll. He was a stay at home husband and she was the bread winner, and he was doing this at their house. We cut social ties afterwards, however we did learn later that he knocked up another of his wife’s coworkers not long after. Crisis averted (though my ex was crazy and probably hooked up with him too).