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
I tried a separate world with no loyal trait and it still happened. I think it's unrelated, just more alarming if your sim is loyal and suddenly cheats, so I think that's why people are reporting this bug because it's more noticeable/annoying, you feel? Hope it gets fixed soon because I can't play until it does lol
