Can jealousy be good for a relationship? We know many stories where one partner harasses the other with his jealousy. And we think about the need to get rid of it. But it's not that simple, world-renowned psychotherapist Robert Leahy tells us. Jealousy indicates that relationships are important and valuable to us. Leahy offers us a more nuanced understanding of the phenomenon of jealousy. From this book you will learn the evolutionary origin of jealousy and why modern man needs it. We often feel jealous because we fear losing the people who matter to us the most. And jealousy can not only damage, but also help your relationship when you master effective skills to keep it in check.