I met a guy when I was at uni. This was in a totally platonic sense and he was a little bit... intense. He was always saying that things we did as friends etc were "the best days of his life" and, looking back now, I have a sneaking suspicion that he perhaps has undiagnosed ASD. I also have a feeling he is either gay or perhaps asexual, but because of certain cultural things he would never open up about it.
He was lovely and a good friend but he would have these "blips" where I would get hectic middle of the night calls that he was wandering around a bad area at night and everything was shit etc. Making me panic that something would happen to him. It was always such an extreme pressure to be "bestest bestest friends" and to be honest I found it really tiring.
After leaving uni I moved from the area and met my husband. He would randomly jump on the train and turn up at my house. He'd never been to my area before but walking around the town with me his mum called him and started shouting his cousin had phoned her and that he was walking around with a "white prostitute" 
Anyway, a few of these visits and I became very tired about the whole thing. He even burst into tears and cried a number of times about the "beauty of the places we showed him" when he visited and we took him out in the car (effectively to wear him out like a child).
When my mum died I had a really rough time and I remember being with my bf (now dh) as he phoned having another crisis when I had been sobbing over my mum, thinking "he's not even asked me how I am..."
I decided then and there I couldn't do it anymore and went no contact and effectively, and I'm not proud of this, ghosted him.
Over the years he's tried to reach out to me on social media claiming he misses me and our friendship, some of the best days of his life were spent together, he wants to see me. I've never replied.
Last night I got another message (first in about two years) saying it was ten years (yes, ten years!) to the day we did x, y, z. How it was one of his best memories and he would give anything to see me and my husband again. I feel awful, he effectively doesn't see that he did anything wrong and although I tried to explain his intensity was too much and I had my own things to deal with, I wonder if I've been too hasty.
Dh doesn't like him very much and supported my decision to cut off contact. I know that he wouldn't be keen to introduce him back into my life and my kids lives. He would be the kind of person who would surprise us with a trip to Disney Land all paid for with him coming along kind of thing and as lovely as a gesture like that would be it's not something I'd want.
Aibu to keep ignoring his messages? I've blocked him in the past and he's made new profiles. I know he's effectively complete harmless but I just feel awful that he doesn't know what happened but even going to explain it to him opens that communication up again and I don't think I can deal with that level of intensity again.