Practise blocking by starting with his mother.
This might lead to a babble of “she was only trying to help you are a fucked up person to block an older woman” blah blah
But it’s obvious that mummy only texted you because she’s having to deal with him more now.
we know this
you know this
mummy knows this
he is the only one who won’t see this
then give him a deadline for his outstanding belongings
then block him
he might them turn up
you can then ask one time for him to stop that as we because it’s harassment then
he is making this as difficult as he possibly can - this isn’t love - so maybe you do or don’t have PTSD - maybe - but you did recognise his bad behaviour towards you, your son and your home - so you aren’t doing too badly @PithyBeaker
you tried, still are, at your own detriment, to deal with this separation with kindness and grace - you have considered hm above and beyond what he deserves - he will never accept this
but you have
so it’s a sunnier Sunday
take your son out
go for a bike ride
train ride to ice cream
look at a painting
buy a Lego set to do together
shove his messages into “archive” so you will get them but can decide when to read his navel fazing bollocks