At which phase do individuals begin to discuss their dissatisfaction with their partner?

The answer is deterioration. The appropriate response is Erikson. He was a German-conceived American formative clinician and psychoanalyst known for his hypothesis of the psychosocial improvement of people. He might be most well known for begetting the expression character emergency. 
Erikson's phases of psychosocial advancement, as explained by Erik Erikson, in a joint effort with Joan Erikson, is a thorough psychoanalytic hypothesis that recognizes a progression of eight phases, in which a solid creating individual should go through from early stages to late adulthood.