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In most cases, men typically assume that once a women is content
with the relationship, she will and should stay that way. He thinks
once he has proven his love for her, then she should know it forever.
She should feel secure with him, regardless of what happens, without
ever needing to be reassured or reminded that he loves her. This view
is different from how women really thinks but from the male point of
view, this attitude makes perfect sense.

This is when trouble sets in because women find this attitude
absolutely unacceptable as it is inconsistent with the way they think.
Like all people who want to be and feel loved, a woman need to be
reassured that she is special, that she is worthy, understandable, and
of course lovable. This is no different for men as they also need to be
reassured, but they get encouragement mainly through their work. Women,
however, primarily need reassurance through the relationships they are
in.

To complete the article, What Are The Differences Between Men