Lyrics seem like it's a guy who got all filled up with rage and beat the hell out of his wife because he assumed that she was cheating on him.
That would probably be the thing she's always done which makes him "blurry".
The song is about the bruises on her body (bruises are blue) that he inflicts, and how the harder he hits her, the more he realizes it is he who is doing wrong (seeing black, the dark side of things).
Lyrics seem like it's a guy who got all filled up with rage and beat the hell out of his wife because he assumed that she was cheating on him.
That would probably be the thing she's always done which makes him "blurry".
The song is about the bruises on her body (bruises are blue) that he inflicts, and how the harder he hits her, the more he realizes it is he who is doing wrong (seeing black, the dark side of things).
Just my humble opinion.