She said if I should decide to date or have sex with someone else to please not tell her. I'm not sure where that came from, but I let her know my plan was to wait until we have made a decision before that would occur.
I'll tell you where that came from but you're not going to like hearing my answer, sorry bro, she's projecting her own thoughts on to you to make herself feel less guilty about what she's done. This happens too many times in every other situation on these boards for it to be coincidental.