#6 Don’t give him a reason to be jealous. It goes without saying, but a good girlfriend is a faithful one. It doesn’t matter if you’re the hottest, most beautiful woman in the room and all the guys are drooling at you. Let your man know that he’s the only guy for you and that he has your full attention. Never flirt around with other guys, and let him know that he can trust you. He will be loyal to you, too.