He's not done using yet. That is the simple truth. You are getting in the way of him being able to use whenever he wants without having to explain anything to you.
I know it hurts and you feel used and hurt, but he is just an addict doing what addicts do. Nothing is more important to them than being able to use. I know it feels personal, but it's not. He would do the same to anyone. You don't realize it now, but he really has done you a huge favor.
Welcome to SR. You will find a lot of support here. Many of us have been through the same thing, so we understand. Take the time to read the "stickie" posts at the top of this forum. You'll find a lot of helpful information there. Please stick around and post often. It will help.