Why do so many relationships fail when certain trigger conditions occur? Why do our feelings so often lead us in the wrong direction? Evolutionary psychology enables us to see how our mental hardwiring has failed to keep up with the changes we've made to our world, so that our most powerful feelings and basic impulses too often lead us to abandon relationships that should Why do so many relationships fail when certain trigger conditions occur? Why do our feelings so often lead us in the wrong direction? Evolutionary psychology enables us to see how our mental hardwiring has failed to keep up with the changes we've made to our world, so that our most powerful feelings and basic impulses too often lead us to abandon relationships that should be our source of ongoing contentment and sustenance.