Well done on not replying, and I'm delighted you had your read receipts switched off!
“I thought you wanted it to be on good terms....”
Well that was before he ghosted you then messaged over a week later to tell you he only wanted a fuck buddy wasn't it.
Don't let him control the narrative here, and do not even THINK about 'what he thinks of you' - what he will try and think is many things, but what he KNOWS is that he's just treated someone like shit and they're quite rightly not willing to engage with him any more.
And he doesn't like it does he? You said he wouldn't message again, and he has. I'm guessing that he's never needed to message repeatedly as you've always replied. It's actually quite likely that in the back of his mind, he was rather intending to still have you hanging around. He certainly didn't expect to be ignored and ghosted himself, did he? There's a bit of a note of panic there :)
Please completely ignore him. Sounds like you've already wasted plenty of time on a tosser who isn't interested in moving things forward. He ghosted you first, now he's been ghosted.
If you really want to drive the point home, I'd maybe 'open' and reply to those messages in about, oh, two months time.
'Sorry to be so late picking up your messages - it's been a really busy time. You ghosted me, so I assumed all bets were off - just to reply to your last message there. Anyway, hope things are ok with you and best of luck for the future.'
He'd hate that - total afterthought.
BUT I reckon this isn't his last message anyway and you'll be getting the pity party let's try again soon.
Don't reply to that, either.