This happened with an ex of mine.
It is very sad.
I haven't seen her in quite a few years.
I hope that she has gotten clean and sober, but I have no idea whether that is the case.
It certainly wasn't the few years following our divorce in which I actually spoke with her a few times.
You need to protect yourself and do whatever it takes to do so.
Your ex may get sober yet - time will tell.
Glad you're here.