I’ll try to keep this short.
Nearly two years ago I fell out with a long-term friend. We had been close at uni but drifting apart for years, yet he always made a massive thing of us being ‘best friends’. (He’s gay, so there’s no chance he has/had romantic feelings for me.) If I go into everything around why we fell out I’d be here for days, but as a snapshot, he claimed I’d ranted at him and torn him to pieces when he’d ‘just had an operation’ (we’d had a calm, clear the air chat - the ‘operation’ was an elective biopsy and he was in the pub an hour later), that I’d ‘snubbed him’ by refusing the offer of a trip to his relative’s holiday home (I’d recently been made redundant - to go would have meant turning down four job interviews) and finally abused me on Facebook and via Messenger for not inviting him to my school reunion night (we didn’t go to the same school). I’d had enough and pulled the plug.
Since we’d both left our uni city long since we had very few genuine mutual friends. To try to get back in with me, he kept messaging supposed mutual friends (in reality friends of mine he happens to know through me) asking them to pass messages on, meet up with him etc. Most have got fed up and blocked him. Last weekend, I met up with a close friend and he popped up immediately with a comment on a photo she’d shared of us. She decided she’d had enough of him expecting her to be a go-between and deleted him.
I felt really relieved that he can no longer pester my friend and that another way to see what I’m up to is gone. I decided I would ask two other friends if they would mind deleting him, as I’m finding it really creepy that he’s still following what I do two years on. I said it was totally their choice and I would respect it if they’d rather not be seen to take sides.
They made all the right noises, saying they didn’t really know why they still had him on FB (they met him once on holiday nearly three years ago). But he’s still commenting on their Facebook posts if I’m tagged - we’re on a trip away at the moment, so there are quite a few - and it’s within seconds. We were joined by some other friends on the second night and one of my friends posted a pic of us all saying ‘Now the whole gang is here’. Ex-friend posts ‘Not quite - one is missing 
’, as if to say he should be there.
AIBU to think they could just delete him when I’ve made it clear I’m uncomfortable? I don’t believe it’s a coincidence that he always posts within seconds - I’m sure he has an alert set up for when my friends post (I know he used to for me when we were still friends). I find it creepy that, although I’ve blocked all channels on my side, he can still see what I’m doing, where I’m going etc. I would never ask genuine mutual friends to delete him, but if they haven’t seen him in years and their only connection is gone, why bother keeping him on Facebook?
I can see I’ve failed on the ‘keeping it short’ bit, but thanks for reading!