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
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.
To help improve the meaning of these lyrics, visit "M.A.A.d City" by Kendrick Lamar (Ft. MC Eiht) Lyrics and leave a comment on the lyrics box