Words of Sorrow and Joy

The devil

You find strength in my weakness.
You find pleasure in my pain.
You find light in my darkness,
And it's driving me insane.

You just laugh when I'm crying.
You punish me for your mistake.
You make sure that I'm dying,
And leave me in a heart break.

You lose faith when I'm fine.
You lose hope when I realise .
You lose your mind when I find mine.
Are you the devil in disguise?