to SR! If your ex is using drugs, NarAnon would be your best bet. It's for friends and families of addicts. We have a specific forum like that here. I'll give you the link.
Friends and Family of Substance Abusers - SoberRecovery : Alcoholism Drug Addiction Help and Information
Here is the site for NarAnon in Vancouver BC
NAR ANON VANCOUVER | Wix.com