Sims automatically perform certain romantic actions, even if they have a dislike for those actions. Because of this, relationship satisfaction drops very quickly. Example: A Sim automatically flirt...
Ideas
My loyal sim randomly cheated on their spouse by using a bold pickup line on a stranger autonomously. Later that sim was kissed by their mother in law In front of my pregnant sim who was holding their infant. I had to exit without saving.
I don't have mods or love struck. I've only had this sort of issue once with a previous update from last winter, so I assume it the update. I've repaired the game but I don't want to play until it's fixed.
Oh my god, me too! I just sent in a report of my own. Maybe it's a bug with the loyal trait, but every single one of my sims (+ unplayed sims) will cheat or flirt, so I don't know if it's some "cross contamination" thing going on... Maybe try starting a new save without a loyal sim in your household and see how it goes?
