Well, I deleted WhatsApp and all my social media to get rid of mine. About 10 days ago.
A week went by. I doubt he noticed, as be used to message me so infrequently!
Suddenly a string of missed calls from him on Thursday night. I made the mistake of texting back, just in case it was an emergency (he lives alone and can't drive).
He begged to be unblocked on WhatsApp. (He wasn't blocked, I no longer have it). Eventually I spoke to him on FB messenger, as I still had that to message family.
There was no emergency. I said I no longer wanted any sort of relationship with him but we could go back to friendship. I said this several times...
He went from messaging me about twice a fortnight (previously) to completely bonkers FB messaging all day. It got more and more desperate including being jealous of a man I do a hobby with (who is 70), promising all sorts and actually asking questions about my life.
I knew I needed a calm and sensible way to extricate myself (again).
Yesterday evening it ramped up to messages that he was jealous because he likes me, he was angry because I did some DIY without asking him to help (half my life is DIY at the moment) and that I "always insult him" but then obviously could not come up with an example of when I had ever insulted him.
So he is now blocked on FB messenger.