It's so sad that your mother is adding to your problem.

From the first part of your message, it shows he declines when you let him back in so maybe the only resolve is to never allow him back until he's been clean for about six months.

I had to kick my son out when he was doing drugs and that was what finally got his attention. It really hurt me to do it too.

I think the other ladies have given you wise advice. I wish you peace with this.