This is a really difficult situation to be in, and I’m somewhat in agreement with earlier posters who are telling you that you have been a contributer to this problem by allowing your wife to get away with this jealous behaviour.
My husband works as a writer and often attends writing events which are of little interest to me. Many of his writing colleagues are female and I have to admit at first I felt some apprehension about the relationships he has built with these women, but then I checked myself and realised that was just my own insecurities. I’ve now adjusted my thinking and don’t have this issue any more.
I’m a bit surprised at those earlier posters saying if you know so much about this person, it must be because you have a romantic attraction to her. I know so much about my colleagues and can assure you I have no romantic attractions to any of them! It’s just the nature of some workplaces that people share a lot of personal information with each other - it helps the time pass on slow days and it helps the team bond.
As an example, when I first started working at my current workplace, I got on really well with my closest colleague. We had a lot in common, most particularly that we both played World of Warcraft. This then developed into a friendship between my husband, me, him and his girlfriend based on our shared interest of things sci-fi/fantasy. We don’t see so much of each other any more due to changes in circumstance, but I stay in contact with his girlfriend via email/IM.
I’m afraid I don’t have any good advice for you, but I do wonder how good your relationship is right now…
Has this actually happened? Has your wife started a fight because of another woman looking at you funny? Does that not strike you as controlling and abusive?