It's perfectly normal to feel a little jealous from time to time, but one must keep it to a happy level or it can damage the relationship quite drastically. Jealousy, that dirty feeling in the pit of your stomach, like a scratch you can't seem to itch. Throughout our normal day we are surrounded by people of the opposite sex, be it our friends, co-workers or strangers on the bus. Working at a retail store there is no way to avoid speaking to other females (especially in the clothing industry) and it may be something your just going to have to accept. No matter where he works, where he is, he's going to run into other girls. The thing you've got to remember is that he's probably with you for a reason and if you've lasted this long together you most likely out shine the rest. Trust your partner unless he gives you a reason not to. Harassing him with your jealously may otherwise lead to his unfaithfulness, "If I'm being accused of the crime, why not go ahead and it?" Have faith in the relationship and all should go well.

Best of Luck...

-Nate Lovestruck