What do you do when you know something's bad for you and you still can't let go?

I was naive, your love was like candy, artificially sweet. I was deceived by the wrapping, got caught in your web and I learned how to plead. I was prey in your bed and devoured completely. And it hurts my soul cause I can't let go, all these walls are caving in, I can't stop my suffering. I hate to show that I've lost control cause I keep going right back to the one thing that I need to walk away from... I need to get away from it, I need to walk away from it. Get away, walk away, walk away.