I've been dating this guy for a little over a year now. He's a great guy, but there's still something missing. For some reason, I can't be faithful. I've been in three relationships that lasted a really long time, and I've cheated on them all. Don't get me wrong, I don't sleep around or anything. I just always get tempted to kiss someone, and I always go for it. Everyone thinks that I'll end up cheating on my husband when I get married and, to be honest, I'm always more worried about me cheating on the guy than about him cheating on me. I can never commit. I just feel that if something makes me happy I should do it, and I shouldn't have to worry about anyone else. I know my way of thinking is wrong, but I can't change how I think and feel. I'm confused. I really don't know what's wrong with me. -Renee, 23