@windswept
Your first post and the subsequent ones don't make me at all concerned about him. He had PTSD and it sounds like he is very invested in treatment. He could totally be playing you - it's hard to say. He could also just be very hurt and making t clear he is moving on. Maybe he sees this as a friends with benefits thing. As far as his PTSD, I think things will get better for him in the long run if he sticks out treatment.
I am however quite concerned about you.
PTSD or not, why would you want to stay with a guy who treats you this way? Screams at you and then goes and finds other women? PTSD doesn't include the symptom of playing around. You are really going to be friends and leave the door open to date again? And you will date when his behavior is 100 percent on the level? How will you judge this?
You very much overly pathologize his behaviors in huge ways. The way you talk about PTSD and him is so very hurtful, it brings tears to my own eyes. While I don't condone his very rude treatment of you, your arrogant down talking of him and know it all attitude would have freaked me out as well, and that's not just because I have PTSD. It's a cruel way to treat any romantic partner.
You talk of slavaging him - to a community of people with the same condition.
Your minor in undergraduate psychology has not given you the practical day to day skills you need to be in a romantic or respectful friendship with someone with PTSD or even a good clear understanding of PTSD. At all. Most therapists have to go through extra training after GRAD school to really competently help someone with PTSD.
People with PTSD don't need our romantic partners to be in the savior role. Maybe you should read up on unhealthy caretaking and codependency patterns in supporters as well as what people with PTSD go through.
It is also pretty unaware of you to come post on a PTSD community and talk about a fellow sufferer as being salvageable or not. Holy cow. You don't seem to have awareness how that might make fellow sufferers feel.
I don't think you should try to salvage this relationship. For your good and his. Don't try to do the friend thing - you will only get hurt and likely trigger the heck out of him again and again. Let this one go. There are plenty of other fish in the sea.
I think you should go to counseling and work on you. We all have stuff, PTSD or not. I tell all supporters to get their own support, including theraputic support. In your case, counseling will likely help you have more successful dating relationships in the future. Counseling can help you learn how to pick guys that don't play you, that don't lie, and that are able to be the safe steady kind of guy you want.