Don't get jealous. You should be loving, but not to the point where you start seeing red the second your boyfriend talks to, or even just mentions, another girl. Nothing will turn your boyfriend off faster than a girlfriend who is so insecure that she can't stand the thought of other women existing in the universe. Your boyfriend will appreciate you even more if you're nice to his female friends instead of talking about how ugly or annoying any girl you see is.
If he's out with his friends, don't text him every two seconds to make sure he's not talking to other girls. This will only make him see how little you trust him.