Susan here-- This happened to me with the wife of an acquaintance. She actually tried to make a public example of me in a shopping mall. We ran into each other and she immediately pointed a finger at me, with her husband at her side," I know who you are and the all the sex you have with other people ! "
I replied calmly and looking directly into her eyes,"It's the exact type of sex your husband wants to have with me. Think ! How would he know ? I never discussed it with him and this wasn't something that you discovered unless you want kiss me too ?" We call it a hypocritical paradox when someone realizes the truth at the same time they see their own hypocrisy and go into a meltdown. She realized her husband had to have been on an internet site to have known about me. She just walked away.
Never allow yourself to feel guilty about having responsible, consensual, adult, fun . And, don't take crap from those trying to define who you are because of it.