He just left with the OW (who is not his gf)

Okay, I do not get it and cannot believe it. The ex-narc and his current OW just left our office together, openly, in her car. But he has a gf, and so far has been hiding his relationship wiht the OW from me (so it's definitely an affair).

They just came back from a trip overseas (for sex, without a doubt) and then today went out for a two-hour lunch. Now they are going somewhere in her car. Someone just wished them a good time at the function/event.

I know he's seriously disturbed--but how the hell is he getting away with this? Is everyone else nuts as well? His gf? The people here at work?

Why am I the only one who seems to see it, when he's done this already to me when he and I were together (he had another OW at work, who has since left).

He had the nerve to wish me a "lovely long weekend" before he left to go down to her car. Wtf???????????????????