gf talks about co-worker etc?

Tell your other half, that you are beginning to feel jealous and think that this guy is sounding more like your rival every day, and why is he so important that she needs to give you updates constantly. Indeed if she is so busy working how does she have the time. Watch the reaction on her face, which will speak volumes. She will either justify it, deny it, but once you initiate the dialogue the ball is in your court, Good luck man it out.