If you thought 2 co-workers were having an affair (1 is married) should you confront them?

Confronting them would be stupid. WHY?? What co-workers do away from the job, in NO WAY impacts you. Following them is stalking! Saying anything to ANYBODY is cheap gossip. Starting rumors is destructive and cruel.

Until you actually peek through a window and record them having sex, you don't know ANYTHING. They might have been joining the married one's spouse for a social event, for all YOU know.

Even if you did know for sure, everyone including YOU, would be best served if you never say anything.

No.

Who made YOU moral policeman of the world? That assumes a lot of arrogance, don't you think?

The proper action for you to undertake is to sit down and try to open up to why YOU feel so threatened by what you perceive as someone else's cheating. Something is going on inside of you that you are not honestly facing, and you need to face it. As soon as you do this you will lose this desperate compulsive urge to "correct" other people's behavior.

And anyway, it's not like you opened the janitor's broom closet and caught them screwing. You are just making assumptions.

No, it's none of your business. For all you know, their spouses might be totally fine with it (it's called polyamory and is very common amongst humans, even those who wouldn't admit it). Why should you be a jerk to someone about their business when you have no idea whether or not their spouses would even care, anyway? If you like your work environment not being hostile, don't bring hostility in it.

So you think they're having an affair because they drove off in the same direction but live in opposite directions....ok then.

It's none of your business. Get a life; get a boyfriend and start fulfilling your biological obligation to attempt reproduction with someone every month.

Nope. It's none of your business. You don't want any unnecessary drama coming your way bc you felt like budding in.

And this is your concern how? It's not. Maybe they should confront you about being a suspicious, judgmental busybody.

no this is none of your business what if someone saw you doing this would you want them to confront you? mind your business, while you are in someone elses business yours is going lacking

Honestly stay out of it. The drama this will bring to your life is not worth it.

You really need to get a life of your own.