Your friend has to admit he has a problem and make the choice to do something about it There is help and support out there if he wants it.

For myself, once I find out there is a problem I walk away. I have learned that if a person isn’t willing to recognize they have a problem there is nothing I can do. And I distance. There are too many lies and babysitting and coddling that comes with this problem. Not to mention the mood changes and anger and impulsiveness and euphorias that go along in their cycle again. No thanks.