Bottom line is we cannot change anyone, only ourselves. Hard enough for me to believe when its my AS and I still struggle with that. I hate to say it, but given his active using, he probably is just looking for someone to lean on or use, especially since you've shown you care. Kind of cold, but I would close the door. You've done what you could. BTW....how did he get your email? Protect yourself and Let Go and Let God.