I have a friend (male) I have known over 25 years. I care about him like a brother. A few years ago (after he got divorced) he met and then started spending time with a group of younger people. I was happy for him to begin with as he seemed to be turning a corner from being depressed about the divorce, but it has gone on to more serious partying and now involves a lot of drugs and alcohol, late nights etc and he is not getting it together to work or earn money any more. He has confided he is in debt, and had to take a lump sum from his pension to pay his mortgage. I can see his depression coming back because of this, and I tried to talk to him to say he needs to step back and cut down his partying but he worries if he does his new friends will drop him.
I live in a different country, so can't be there in person to get him to do different things or take him out with me and my family, although I have told him he can come visit whenever he likes (covid permitting). We talk regularly on the phone but nearly every time we do he is either drunk or under some influence of a drug. I am so worried and want to get through to him that his lifestyle now is damaging him.
Does anyone have any ideas about what I can say to help him see how much he is hurting himself and his future and get him to at least cut down a bit? I don't want to have a big argument with him, or lose him as a friend, but I am so worried to see him going downhill financially and emotionally.