Why men are so restless in relationships: there's a new breed of dudes who claim to be devoted to their women, yet still won't bag the bachelor life completely. What's with the commitment allergy? Cosmo finds out and offers advice should you realize that you're with a gun-shy guy.

* For women, men used to be easily pegged into two categories: the ones who were open to settling down and the ones who weren't. A new hybrid breed of boyfriend is on the rise however: guys who prefer long-term relationships but still need an escape hatch out of them. They're devoted partners--some even serial monogamists--though they're terrified of becoming fiances or husbands. In other words, they're relationship-ready yet still restless.

"These men are constantly struggling to balance two competing needs: one for safety and security, the other for excitement and the unknown," says clinical psychologist Alon Gratch, PhD, author of If Men Could Talk. "By having a serious, long-term relationship that lacks total commitment, they think they're getting the best of both worlds."

Take Diddy, who's dated his girlfriend, former model Kim Porter, on and off for 12 years. Besides a 9-year-old son, they're also parents to 3-month-old twin girls. But despite living with her, sharing children, and calling Kim "my muse," he also claims that he's "just not ready" to marry her. Then there's Owen Wilson, who at almost 40 has had a string of exclusive relationships but says he still feels the need to "experiment [with] and ...