Why is it a man's job to make accommodations for a woman's insecurities in a relationship, but it's not a woman's requirement to do the same?

Seriously, why should a man be forced to make major life changes to deal with a woman's insecurities, to just accept them the way they are, but the same is not true for women?
Why is it a man's job to make accommodations for a woman's insecurities in a relationship, but it's not a woman's requirement to do the same?
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