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When he says "'cause my past is a poison and I'll never find a cure" he could be referring to the fact that he can't forget or forgive what was in his past, and it's a part of him he can't get rid of, no matter how painful it may be.
When he says "'cause my past is a poison and I'll never find a cure" he could be referring to the fact that he can't forget or forgive what was in his past, and it's a part of him he can't get rid of, no matter how painful it may be.