I guess you are at an advantage
Cause you can blame me for everything
Since he was the one that made the mistakes in the relationship (not being romantic, not being intimate) she’s at an advantage, cause she can blame him for the two of them splitting.
Also, at the start of the song he blamed all of the mistakes on the girl, because he could. Now, because of these mistakes, he can’t do that. He’s left himself vulnerable for the blame and has gotten to the point where he just can’t blame her anymore.
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