They say, "You can't turn a bad girl good
But once a good girl's gone bad, she's gone forever"

from Jay Z – Song Cry Lyrics on Rap Genius

Meaning

You can’t change a bad girl from her habits, she’s stuck in her ways. It is far more tragic to mess up a good girl because there’s no turning back from that, she will never revert to her old self and Jay is the loser in this scenario.

This line inspired Rihanna’s album title Good Girl Gone Bad years later.

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