See and that is just it. If this has happened a few times prior, it makes me very suspicious that it was THIS time that he decided to 'say sorry'. That either means he didn't mean sorry the other times, or he recognized he had to press the 'oh shit' button because you meant business this past time.Tell him to get therapy for that along with his ptsd.
Also, he had a T; and didn't think enough of you to talk to T about the other incidents because he didn't want you to have to put up with his behaviour anymore? Nope. Just this time. When there were consequences for him. And I bet the meeting was about poor him.
I wouldn't bite. I wouldn't even nibble. Have a drama free life my friend. Life is too short for this shit. Especially when you see it coming.