Sounds like he still can't get his emotions under control and keeps acting weird with them hence the new block. He could've read further imagined negatives into your last response or something.

I wouldn't think his last message was about breaking up, he's still thinking. But yeah it sounds like that while he's not talking to you he maybe got stuck in thinking negatively about all this in a really distorted way.

If I were you and if I still wanted to give it another try, I'd message/text and ask to meet IRL to really clear up the misunderstanding