Lyric discussion by o210n 

The lyrics get even more interesting if you assume that he's the only one in the song, he's talking to himself in the mirror. What he was, the good; and what he now is, what he addiction has made him, seperated by the mirror. It makes sense if it's about realising an addiction.

"How in the hell could you possibly forgive me? After all the hell I put you through"

For example.

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