Why do girls who are physically violent in relationships try to play it off as nothing?

Like my ex girlfriend smacked me twice and told her family and friends that it was a light tap. Also how come no one has an issue with it her parents were in an abusive relationship. She also goes you would bring that out of me and no joke we was playing video games one night when it happened.

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Why do girls who are physically violent in relationships try to play it off as nothing?
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