He can't see what he's doing to you because he's focused on himself and his addiction.
I, personally, would let him have his stuff. I understand the need to hurt him like he's hurt you, but you will never 'win', nor force him to stop using. If you pack his clothes for him and leave them by the door ready for when he calls, it's one less thing for him to pester you over.
I really feel for you. I understand, and your pain is visible in your posts. I hope you get some peace soon xx