Hi,
You have every right to set boundaries about what you will or will not allow in your life. That is not wrong.
I don't know your story, but I can guess that it's a lot like mine and the stories of so many others. It's hard to back away from someone you love when you fear that they are destroying themselves. But addicts will do what they want to do whether we are there to see it or not.
It is not your fault. You can't control it or fix it. You are wise to protect yourself and your children. With addicts, words don't mean much, only actions.
love and hugs!