I'm sorry, mis, for what you're going through. I have a brother who has been addicted for 25+ years. I can't have any relationship with him; his wife, who was one of the dearest and sweetest people on earth, has also become addicted.
It sounds like there is nothing you can do at this point except take care of yourself and stop enabling. I recommend that you go to Al-Anon, which is for people with friends or family who are addicted to drugs or alcohol. They can help you stop enabling and find some peace.
Regards,
SandraC