How do social and intimate relationships evolve and change during early and middle adulthood

Social and intimate relationships are at their peak during the early middle adulthood but would descend and decrease in warmth as they tend to face problems and go through the same routine daily for years.

Explanation:

In the early middle adulthood, many adults have already married and may be at the peak of their emotional attraction and affection so they are happier. However, as time pass, they experience problems already as the bliss of honeymoon has waned. Clashes in personalities occur and they tend to be doing things by routine so they are become less happy.