<human>: My ex husband and I signed our divorce papers last week. I didn't want to, I wanted us to get therapy, but he insisted he was done. He has severe depression, anxiety, and suffers from alcoholism. He has suffered from each mildly his whole life, but they all exploded after a bout with cancer (which he has since beaten). And all of which he consistently blames on me, only to apologize for later. 

He has a pattern of trying to escape situations when they don't "fix" what is broken with him; I just happened to be the latest thing that didn't work. There's a lot more to the story but the gist is this: 

He hates himself, and doesn't have very many friends. His parents are manipulative and encourage his drinking, despite him struggling with alcohol abuse. So today he wrote me a long apologetic note (like so many I've read before) and wants to be friends. 

But I don't want to. Every time I've let him back in my life, he's gotten drunk and blamed me for all of his problems. Just before we signed the papers he told me the only reason he feels any anxiety is because of me. Then this morning he took it all back. It's a constant cycle with him that I would rather get down from. But he needs all the support he can get, and I know he isn't getting much. And the really crap thing is, I still love this person. Beneath all of the issues he's a great person, and it breaks my heart to see him suffering and lonely, I couldn't possibly cut all ties. 

But it hurts even more when he turns on me. How do I know that he isn't just going to blame me for all his woes tomorrow? 

So what do I do? Is it worth to try heathy barriers, or am I just asking for a lot of hurt down the road?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Depressed ex husband wants to be friends despite constantly blaming me for his problems. But he needs support. Do I keep him in my life?