meaning of the song unforgiven ii from metallica.

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Hello friends, I want to understand the meaning of this song Unforgive 2 by metaillca. What situation does make the singer sing this song?? who is unforgiven , the girl or metallica himself?? do you have any understanding of this song, can you please tell me the meaning behind this song. I love this song, because the emotions are strong, but I still not able to understand the true menaing of the song. Need you help.