We broke even
I made allegiance that made a promise to see you bleeding
You know the reasons but still won't ever know my life

from Kendrick Lamar (Ft. MC Eiht) – M.A.A.d City Lyrics on Rap Genius

Meaning

Something violent-related, possibly him getting jumped, has Kendrick making a promise to get revenge. But when he seeks revenge (and presumably kills him) he’ll never know him really.

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