You are a wonderful friend.

I wish I had some good advice for helping your friend when he is in the mindset you describe. Not sure what country you live in, but I think there are crisis hotlines in almost every country and one doesn't have to be suicidal to contact them. One can usually call a crisis hotline for someone else or for help in learning how to help someone who is in trouble. Do you think that is something to consider?

If for some reason you contact someone on a crisis hotline who is not helpful, for whatever reason, ask to speak to someone else.

Depression can make a person hard to talk to. This is not the fault of the depressed person, but of the depression. Crisis hotline personnel can often be helpful in these situations.

I wish I had something better to offer you. Hopefully others will.

I hope your friend will not do anything to harm himself . That would be so tragic and such a terrible loss!