Sometimes I really feel as if I'm burning out my soul

from Big Boi (Ft. Kid Cudi) – She Hates Me Lyrics on Rap Genius

All the fights Big Boi had with his girl has drained him emotionally. He feels like he’s used up his soul’s energy trying to resolve all the fights.
Also wordplay from the previous line with sole/soul
TRIVIA
The album,Vicious Lies and Dangerous Rumors was originally titled Daddy Fat Sax: Soul Funk Crusader

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