(((Kcola))) - I'm glad you told your big brother. You are right - YOU need support, and your friend is not in a position to give it to you. He's probably downplaying what he's doing.."not THAT bad, just do it on weekends, still have the job/boat/etc.) but we consider those "yets", as in "not that bad YET, haven't lost anything YET).
Again, I know this is hard to hear. I got frustrated when my exbf, and I understand addiction. I'm also a codie, though, and guess I still had delusions that since we shared the addiction, we could share the recovery. I'd recommend finding something else to do on weekends to keep your mind occupied. I spent a few decades worrying about loved A's, and it never changed anything. Those who have chosen recovery? Totally supportive. Those who don't? Well, I didn't listen to anyone else until I was ready.
Hugs and prayers,
Amy