Cyanide

I'm corrosive, cyanide to your mind.
You swore you wouldn't need me,
You could break me,
But you lied.

I love this game,
We play it all the time.
Let's see how long you last
Before you're once again mine.

See, you need me, you do,
I'm the love of your life.
We are one, connected,
I'm the handle- but you're the knife.

You started this exchange
But now you want to end it.
Oh, but you can't leave me-
For we're the perfect fit.  

I hold your heart,
And between you and me?
We both know the truth,
You won't ever be freed.  

So let's stop this nonsense,
Stop the fiction.
I run your life,
I am your addiction.