How does he know what's going on in their marriage? If you want to tell the partner about it then you tell the partner about it you don't do it on LinkedIn like a crazy person.

How's that help anyone? The wronged party is still wronged, and has been publicly humiliated by what has happened, or there was nothing going on and they misinterpreted something, and have shown themselves up to be a total to tit. Literally no benefit to this strategy.

Note to self, invite this guy around after work because he's a total mood killer