jealousy is natural but chill out. he says to trust him, if you really do then just put it out of your mind and let him get on with it.
i say this because for me it's the opposite. hubby is in pak at the mo, where he doesn't have much contact with female colleagues and doesn't have any female friends. i'm in the U.K. and work as the only female in a group with 5 guys.. most of our building is male too. we're a pretty close group at work at least; go out for lunch, talk about everything, joke around etc. he knows he can trust me 100% and he has some trust concerning the guys too, he knows that they won't make any moves on me. so he might not like it but he's cool with it and never gives me grief. makes me love him even more.
You have a good point. I'm just annoyed by her I guess.