You are using a lot of "yeah but what about this extreme edge case?".

Edge cases are edge cases for a reason. If two people are dating, it is usually obvious and everyone knows.

It is obvious, and out in the open, and if someone asks, the people dating will probably say "yes we are dating" or humm and haww like they have obviously been caught.

People in general are very bad at lying and keeping secrets, especially from people that they spend 40 hours a week with every week.