I [17f] am having issues with one of my friends [18m] convincing himself everyone hates him.

For the bots: we have been friends for about 3 years.

Apologies for the wall of text.

I have a friend who is convinced every single one of our friend group hates him. He recently caused an argument (attacking someone on facebook for no apparent reason and then taking to twitter... ah, the joys of social media) and so a few people are mildly annoyed at him but this is very out of the ordinary. The problem is he has messaged several people (and tweeted) that none of our friends make ANY effort with him and no one really cares about him (he went so far as to say that 'you're all cunts, go die. i don't care'). He then said he was just going to use our friend group just so he had people to hang around with but he hated us all and we drive him to depression with the amount we bitch about him. This really bothered me because I, for one, have stayed up late many nights (despite having my own illness which means I need to sleep a lot) to just be there to speak to him/so he has someone to talk to, rant at or confide in. When he was very ill I offered to take him to the hospital or go to the doctors with him - I was even going to walk 2 miles to his house after a long school day to bring him food until he told me not to bother. Besides that, another friend was there for him through his breakup last year and was there for him basically 24/7 and we all dropped everything to go out and meet him whenever he asked.

He seems to think that we all talk about him behind his back which is genuinely bizarre - my group of friends are NOT bitchy about him. He has told us many times how we fail as friends and he'd rather kill himself than stay friends with us - despite me being there for him, he barely remembers me and only uses me if no one else is free. I try to be patient and understanding as he has had depression previously which he took medication for and has a bit of a weird family relationship but I'm starting to reach my limit. I want to be friends with him but he is a very self centered person - if you don't talk about him or his problems, there is no conversation. I'm reaching my limits. There's only so much crap I can take before just snapping. The problem is, this guy does not do communication or confrontation of ANYTHING. If you attempt to talk to him face to face about this kind of issue (which I have) he either walks away or just shuts off - the best you get is an "mmm".

I respect that he has his own issues, I do. But he doesn't realise we all have our own lives too because he doesn't care to ask. I feel really bad because I've been thinking badly about him but I just don't think I deserve this in a friendship... I have tried to support him but it's upsetting to have some of the things that have been said about me said. I don't know... am I being selfish?

I guess this was partly to rant but I'd really appreciate your insight in to this. I don't want to cut all ties as I don't know what that would do to him but staying friends and pleasant is becoming increasingly difficult when I now know for a fact he's just using me (and others) to get through school. What do you think? Sorry for the teenage drama angst... Thank you!

TLDR; Angsty friend thinks everyone hates him and treats all of our friend group badly by disregarding all our efforts to care. I don't know what to do.