Recently my best friends (29m) anxiety has been out of control. He’s reading my messages convinced I’m chatting to other men even thought we’re not dating. He’s jealous and is convinced I’ve made all my friends hate him when I haven’t. He gets into such paranoid lows and takes it out on me because I’m the one that’s there. But if I leave him, he’s got no one. Even though he’s pushed everyone else away convinced they hate him and they don’t. The constant reassurance I give isn’t helping, he just accuses me of lying. I don’t know how much longer I can be around him like this. 
How do I make him accept that the worlds not against him?