I really truly feel sorry for him, I just too well know how much this hurts. But please....don't blame his PTSD for this. This seems like an easy excuse for his behavior and decision, while it really might not be the case.
I know a lot of your questions, thoughts and feelings because I did have the exact same. I know a lot of the other side's behaviors and comments, because they were the same - again, from someone who does not have PTSD.
Please don't take this the wrong way, but this really just sounds like a "normal" break up. As hard a pill to swallow as this is.
Right now it feels a little bit like your clinging on to the "lifeline" for a possible relationship that is his PTSD. You're thinking - feeling, really - that if it wasn't for his PTSD, you two would still be together. And if only he would see this, see that it's only his PTSD talking, you'b be together again. It's your hope and I know very well how much hope, any hint of hope, of a continuation of a relationship after a breakup can keep one afloat, keep one going.
I do emphasize with you and I perfectly know you don't want to hear and accept any of this at this point. But please be careful to keep blaming his PTSD and be careful to keep analyzing him. Your posts about him are borderline belittling and heteronomous (you know what his problem is, you know what he needs to understand/change, you know he needs to "grow up" ... ) ....but - and again, I know this from experience, I think this is just part of the whole acceptance process for you and that at the moment you >need< to do this, for your own good.