I understand your description of the jealousy thing. I can understand why you would be feeling some jealousy if he was talking about a coworker a lot. Not knowing the person can lead you to imagine that other person to be better looking and more attractive than they really are. Meeting them in person and seeing how they interact should tell you how they really think about each other. I was supervising an intern a few years ago and I was just telling about my day to W in the evenings and I think I may have been talking about her a little too much to the point that my W really got worried. In combination with her own insecurity, it might have triggered (or at least contributed to) the current crisis in my case. This intern now works at my office and got married recently and is still a very good friends and lives just down the street. And W is fine with her now that she's met her lots of times, because she watches the boys every once in a while. All this to say that I think it's normal for you to feel that way about his coworkers.
So, was this other guy really obviously flirting with you in front of BF? Does he know him?
