You're in a relationship. Maybe you've been together for a while or you are just starting out. Maybe you're living together or just thinking about it. It seems great. But you want to be sure.

With the decline of marriage, the relationship game has changed. Yet we're still not very sure about how to play it. Moving in together early on has become the new social norm, but it's not risk-free. The nature of cohabitation itself can encourage ambiguity and drift in a promising relationship and make it hard to end an unpromising one.

Accepting that cohabitation is here to stay, Harry Benson offers a roadmap to navigate the ups-and-downs of modern relationships. Drawing on the latest research on relationships and commitment, he introduces the Two-Year Rule and other Rules for Romance that will help couples make the right choices, find the reliable love they seek, and, ultimately, to "commit or quit".