Many women have trouble with this aspect. Men have a tradition of a night out with the boys. Women, especially working women with children, have so many duties and responsibilities that they don't feel they have time. Women are more conditioned to see their lives in terms of their relationships, especially their spouse or partner. Lesbian women tend to have trouble because they see each other as one another's total support system.
Improvement here is tied to other aspects.
Re-distribute responsibilities so that you have time carved out to pursue your own interests and friendships. Once you have the time, plan to use it. She takes an interest in his life outside the relationship. She has positive regard for his characteristics. She tolerates non-destructive faults.