Whether we should stay in or leave a relationship is one of the most consequential and painful decisions we are ever likely to confront: few other issues will have such power to trouble us. What makes the issue so hard is that there are no fixed rules for judgement. How can we tell whether a relationship is good enough or plain wrong? How do we draw the line between justified longing and naivety? Is sex vital or could it be foregone? Does someone better actually exist? How much should the feelings of children be counted (and what might they be in the long term)? Could ones partner change, perhaps with therapy? All these questions typically haunt our minds as we weigh up whether to stay or go. With no axe to grind or ideology to promote, this book walks the reader gently through their options and opens their mind to perspectives they might not have considered.