Welcome , Kris. I know this is a difficult walk. In AA we say that recovery is for those who want it not for those who need it. The addict has to come to the end of themselves. Hit bottom. It is excruciating to watch someone go through that. Which is why the best thing we can do for ourselves is to detach with love. Marcus Aurelius said:" Stop caring what others think. Stop caring what others feel. Stop caring what others do".
There is nothing we can do for an addict until they are ready. It is a tough truth to accept.
What we can do is to control ourselves, be kind to ourselves , take care of ourselves physically, emotionally, and spiritually. In that, we live by example. We become a role model for anyone who cares to look. We do it for us.