If he’s done this three times already, absolutely ignore. I think my initial assessment was the correct one with this new information. His other contact attempts didn’t work so he’s trying this out. None of us knows what he wants or is up to, but for your own sanity, it might be best to ignore, block and move on. Even if he is genuinely sorry, you don’t need to respond.
He can’t give you closure. Only you can give yourself closure.
And you’re right Copa, people can change. I should have added “people don’t change that fast, it takes work” when I wrote that.