Jealousy isn't worth a relationship. You should only get jealous if you know for a fact she is cheating on you. Other than that, just don't worry about it. If you are jealous, it will appear as if you are trying to control her. If she thinks you are trying to control her life, she will probably leave. It's normal for girls to have many guy friends. Just as long as you don't see her screwing them, it's nothing to be jealous about.