even as othello swears bloody revenge on his wife he cannot quite believe that she is false quote from the text to show this duality of thinking

From the text:

Yes, let her die and rot and go to hell tonight.

She won’t stay alive for long.

No, my heart’s turned to stone—when I hit it, it hurts my hand.

Oh, the world never saw a sweeter creature.

She could be married to an emperor, and he’d be like her slave!