I've been with my boyfriend for five and a half years. We started dating right after high school. He has been loyal to me this entire time and I believe I've experienced love that only few people will understand. Our problem is that now he is thinking about other girls. I know he doesn't want relationships with them, he just wants the experience of a single 20's guy that goes to wild parties and I guess has one night stands. He is extremely sexual and before me has been with many girls. He tells me that he truly loves me and would want me forever, but he can't get past his desire for other girls. It's not like I'm ready to settle down or anything, but I'm scared to lose my love. What should I do?