well... you mentioned earlier that you would have a problem with her going off to lunch with some guy she met at the mall. so - it's not the fact that you "only" want her to be professional with clients, it sounds like a lot more than "just" that. it sounds like you have a problem with her making new friendships with anyone she meets. to me, anyway.

i think your last sentence summed it up "i don't like another man all up on my woman". if your fiance is happy with that, then fine. if not - then maybe you need to reassess your views else she decides it's getting "too much" like last time you almost broke up.