The reddit hivemind gets triggered by the very idea of cheating. As far as I know, there was no cheating in my marriage and eventual divorce, but it didn’t matter to me if he cheated or not. It mattered to him that I didn’t cheat, so I didn’t. From my point of view, I’d have a problem if he was spending all his free time with someone else instead of helping with the house, chores, relationship, and so on, but random sex was fine by me – as long as it didn’t result in pregnancy or become a full-blown relationship.
Years ago I read some paper about how humans have two primary and competing reproductive strategies: monogamy versus promiscuouness. It theorized that cultures tend to codify monogamy as the standard to follow because its proponents get very hostile to the promiscuous whereas the promiscuous do not much care what the monogamous do.
I’m doing better without him, so don’t worry too much about it. Old women tend to live alone simply because men die younger, so it’s no biggie if some of us start that trend a bit early.
I remember an old guy who really wanted to remarry when his wife died, courted and married someone new, and then expected her to do all the household chores because that’s what women do. She was aghast. He hadn’t given any indication that what he wanted was a free maid while wooing her, and she backed out of the whole thing immediately – much happier to be on her own than take on his expectations.