I have a sim who I was working with and when I closed the game he had the eternally faithful moodlet. Upon opening the game next time, this moodlet was gone. So I checked the girlfriend, she still has hers, and I had my sim ask a couple townies "what people say about him" and they say he is eternally faithful. How can a sim lose that icon. I've checked all his friendships - no romantic interests other than the girlfriend.
Can I assume that when people talk about reputations like cheating etc, it would be an icon in the moodlet panel. Because I've never seen any type of reputation for any characters, married or single, except the eternally faithful one. I've broken off a couple relationships with the "let's be friends" option but they were only romantic interest that happened without my knowing while working at other sims homes. So the red heart showed up in the friendship list but there wasn't anything in the moodlet panel.