Please spare some time to read this. This is a very personal topic and I really need help because I don't know what to do anymore.

My brother was diagnosed with catatonic schizophrenia two years ago and he's recently starting to finally heal. I was 16 at the time and I'm 18 now. He had a childhood friend who was his best friend at the time but he was the one who introduced him to DMT. This introduction to DMT caused my brother to eventually start using it every day, especially when the road got really rocky. He had been kicked out of the Marines when he was 18 because he had told them about past suicidal thoughts during the "moment of truth" they have for them. After he got kicked out he was never the same and he was constantly depressed. 

He was completely sober and extremely happy in the events leading up to his new life in the Marines. After that, it's like he gave up hope. Now the friend who introduced him to DMT recently got out of a state hospital and wants to rekindle his friendship with my brother because "he thinks about him all the time and speaks to his soul." Mind you this friend was in the hospital for schizophrenia as well. I told him how bad my brothers condition was and how he'll never be the same. I ended up showing him a video through Messenger to portray how bad my brother's condition is.

Instead of expressing remorse or responding like a normal functioning person he literally said " YOOOO I just looked in his eyes and I saw so much enlightenment in him. He looks lit!" I was immediately offended because how could you see a person in a vegetative, unresponsive state and say some insensitive shit like that as if you're some sort of healer. Especially because I've been here through my brother's struggle and it is far from enlightenment. 

His intelligence level has dropped since he developed catatonic schizophrenia and he's completely disorganized and unusual in his thinking and actions now. He used to be the smartest person I knew before he started using DMT. Smoking weed only causes him to be catatonic with his condition now and the friend who wants to rekindle this relationship smokes weed. I can only see this taking a dark turn. (NOTE: I don't use or condone drugs of any kind ever since this happened to my brother)

Anyways, he always seemed so happy when he was around this friend but eventually cut contact with him when he was still normal because this friend could be described as unfeeling and manipulative. However, my brother is constantly isolated and UNTIL I buy my car (which is very soon this year) I cannot always be there to hang out with him and socialize. I want to give my brother a friend that he can spend time with and trust but I'm unsure of whether or not it's a good idea to give that friend that sort of place in my brother's life. If he hadn't been there in the first place maybe things would've been different. It makes me really uneasy to think about it because I have a feeling that he will only derail my brother's progress rather than help it. 

He's honestly completely deranged but again, I just want my brother to have a friend and my brother always seemed to really like him and get along with him. I can be that friend but I'm moving away for college in August and will only be able to spend as much time as I can with him after April. What should I do? I'm very unsure at this point because I feel bad for my brother but I don't want him hurt worse than he already is.