It's close to go and trying some coke
And a happy ending would be slitting my throat
Ignorance to cope man, ignorance is bliss
Ignorance is love, and I need that shit

from Kid Cudi – Soundtrack 2 My Life Lyrics on Rap Genius

He’s saying that he pretends not to know the sad truths, or he’d rather not know these truths, because he’d feel better about things if he just wasn’t made aware.

He’s talking about he’s close to cracking and taking coke again, but the only way to be truly happy and leave that shit is to kill himself. He also explains how he needs ignorance to cope & love and it kind of helps him function.

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