I know a store manager who claimed he had a “nisayon” every day because it was his “job” to be friendly (and he interpreted that as flirtatious) so that the women come back to shop there. And naturally, there were some who flirted back and then his imagination went wandering…
If this is a real situation, my advice is to write a strong letter and let the guy know his behavior toward women is inappropriate. I can assure you the behavior isn’t isolated to just your wife and there are other wives too. Like this, he will take good stock of his own behavior, afraid it may be anyone of those many womens’ husbands, fathers or brothers. And through such yira will eventually come yiras shamayim.
But if you sign the letter, he knows how to isolate and readjust, and the behavior will continue with others until he finds himself in hot water…