Years ago, when I first tried to control my drinking, (that didn't work, but it's a long and familiar story.....), I realized that I had friends and I had drinking buddies. They are not the same thing.
Luckily, because I'm a lot older now and have a group of very moderate and even non-drinking friends....I haven't had to make that choice. But, 20 years ago, I did find myself making that choice.
And, here is a happy ending to a story: I had to distance myself from one of my best friends. Our contact was all about drink and drugs.
Years later, we established contact after she had quit the drink and drugs and now we are closer than ever.