Now I never, wanted someone, to die, so bad in my fucking life

from Eminem – So Much Better Lyrics on Rap Genius

Meaning

He flows the hook in a way that makes him seem like he never wanted anyone to die, until he brings in the so bad in my fucking life which causes us to realize that he definitely wants people to die, just never this bad.
We also know (thanks to other songs) that he also want his father to die, but considering he has sung about slitting Kim’s throat and leaving her to die, we can infer that he really, really, really hates this bitch.

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