Indeed, the legal term for such actions is called, "sexual harassment," and can carry extraordinary legal/civil ramifications. The original poster has only managed to provide hints and allegations of an affair that cannot be supported (document, document, document), and it's obvious, from the language in the posts, that the original poster is harboring jealousy, rage, and a baseless sense of vengeance in connection with the supervisor-in-question.
Well said, Zoe. The original poster was obviously seeking justification for their tendencies to be a busybody - this is apparent with the accusation that, if two respondants offer similar responses, then a crowd will follow! What self-serving tripe! LOL A person asks for opinions and then has the gall to make sweeping accusations because they didn't find the responses that they were hoping for (or, expecting). I can't even imagine how empty their personal life must be...
To the original poster: you just go ahead and behave like a sullen child, and keep feeding your jealous, nosey monkey! Entertaining yourself with prying into the business of other human beings will take you down a long, lonely, dark path in Life. So, find whatever enjoyment you can glean from your inappropriate preoccupations and have a happy life, if you can!
Enough said on this ridiculous topic!