Oooo, forgot to address Terry's issue.
Wondering if this is what is happening, Terry...
Years ago I dated someone at work (before I knew better and before it got ugly...) and twice while we were openly dating a girl came up and started openly hitting on me in front of the GF. By hitting on me I refer to stroking the arm (sexual kino), suggestive comments, requests for me to stop by her house and visit, etc etc.
Simply blatant shyt.
You know how we use "social proof" to get another woman's interest because if one woman finds a guy acceptable, other womens' opinion about the guy goes up?
Sometimes this gets jacked up into a pathological condition where a woman is ONLY interested in guys who are attached and make blatant plays for such guys in front of others. It is a proof of their desirability that can only be satisfied by taking someone who is already taken since getting an unattached guy proves nothing.
The key is that this is (speaking as an admittedly non-professional) that this is a compulsion or pathological thing they do.
Why else would someone do this with you standing 2 feet away? Who knows why she picked him and not the 5 other married guys in the office? Maybe your presense has something to do with it.
Not much you can do about it. You feel your guy could do more, but speaking from experience, he's being put in a very uncomfortable position. He doesnt' invite this attention--he normally would enjoy it, of course, but she's doing it so publicly and putting him in such a position that it isn't enjoyable.