How comfortable should a man be in a relationship?

Say a man is with a woman with the intention of being her husband one day, how comfortable should he be in the relationship?

Should he have her unconditional love knowing that he can do mostly anything without her leaving or should he feel as though if he messes up too much she will leave? Should he be as comfortable as possible so that the relationship can feel good and it can last? How comfortable should a man be so that he doesn’t take his wife’s love for granted?
How comfortable should a man be in a relationship?
How comfortable should a man be in a relationship?
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