>Are you also saying you have to disclose to someone you're
>dating anyone you still keep in contact with that you were
>more than just friends with? At which point are you supposed
>to have that conversation?

you dont have to disclose to someone youre dating. you DO have to disclose to your fiancee

>I just assume after a certain age, adults have had sex lives
>and romantic history before they met me. If your partner isn't
>a complete degenerate, it would make sense they still keep in
>touch with or are even friends with at least one of them.

and you should be aware of who it is