Hi
@Cleo1521. Sorry that happened to you. I just had a break up too with someone with untreated ptsd who had no self-awareness and put all of his bad feelings on me (being the closest target). It sucked. While we were waiting for his new apartment to become available, he was constantly critical and jumped down my throat at the slightest comment. It felt very unfair and frustrating. He had a decent streak though and both of us agreed that we would not involve other people until we 100% got through breaking up and was out of each other's hair. I think other people complicate the situation a lot. We might know intellectually that their blame and run is ptsd-related, but it's still about love lost and a broken heart. I did not want to deal with feelings of jealousy, humiliation and betrayal in addition to feelings of abandonment and rejection, nor did I want to put that on him.
I hope you grieve the relationship in a way that helps you. There's a lot of good stuff online about good ways to let go.