This really resonated with me. I recently went through the same. My old childhood friend has been unemployed for 2 years and drinking every day. I realized I was enabling her.

Finally, I told her that she needed to see a therapist because I can't fix her problems. She stopped talking to me. And I was oddly ok with it. Only after she ended our friendship did I realize how much life she was sucking out of me on a daily basis.