I'm glad he listened too. I find it interesting that he was shocked. It's as if he does not understand what "intrusive thoughts" means when it has been discussed in MC. ANd how frequent they can be.
Maybe the frequency and intensity of these flashbacks to what happened he is in denial of and has blocked himself from fully comprehending. Because it is reminder that he caused you years of still ongoing pain.
I think it is normal to have defense walls and thoughts of flight.
I hope the thought stopping helps and the trauma lessens one day soon so you can let walls down more.