There's no one rationale that works for all men, and expectations about a partner having their own space might differ greatly amongst people. But regardless of gender, there are a few typical reasons why someone might want a spouse who lives on their own:
Independence:
For some people, having an independent partner is important, and they respect someone who can manage their own living circumstances and is self-sufficient. Having a place might represent a certain degree of independence.
Personal Space:
Each pair can preserve their privacy and personal space by having distinct living areas. Having a space to relax, think, and spend time by themselves might be beneficial.
Maturity and Responsibility:
It's possible that maturity and responsibility go hand in hand with knowing one's place. It can show that someone is able to manage the obligations that come with leading an independent life.
Flexibility:
Having separate living quarters for each partner allows for greater freedom in terms of keeping separate lives and spending time together. It permits a harmonious coexistence of intimacy and private space.
Financial Independence:
A spouse who can handle their living expenses and is financially independent may be valued by some people. This may help establish a feeling of equality in the partnership.
It's crucial to remember that not everyone will have the same expectations, and that preferences can differ significantly amongst people. In order to comprehend each other's viewpoints, desires, and expectations in a relationship, open communication between partners is essential.