It sounds like you are just not ready for a real relationship. Everyone matures differently, and I believe it is better to admit how you feel than try to force yourself into a relationship because you feel you are supposed to. That being said, I hope you realize how selfishly you are behaving. The guys who are dating these girls are being betrayed, and you are enabling it. You are also being used to fill whatever is missing in the relationship, which is probably why you get along with them so well. All the relationship stuff you don't like is saved for the other guy, while you just have fun. With all due respect, you should stop thinking only about yourself. If you are not interested in a relationship, then don't have one. Date away and drop them before they get too attached to you. If you truly didn't care how you are affecting the other guy, I don't think you would have written this post.
I don't think you belong on Jerry Springer, Dr Phil, or any of those ridiculous shows. Sniff around the wrong guy's girl, however, and you may end up on the News. If this sounds harsh, then good. You brought it up, after all.