Delete and go no contact.
What he says makes no sense and he is trolling for a response
and trying to shift the blame in his foggy mind.
Are you sure you want to be "friends" with this person?
Look how much happier you feel now that he's gone.
Have you changed your locks, by the way?
Do not fail to do that if you haven't.
Glad uni is going well and that you are having fun with son