But is she cheating on you? I mean I suppose you could RP that way. But as far as I know she never actually cheats on you. Yes Faendal will visit Whiterun to visit a friend, and I guess he does have a romantic interest in them. But Camilla never actually returns the interest in either of them. So I wouldn't exactly call it cheating. More like Ysolda you know having friends outside of your Housecarl and not be entirely trapped within your house.