Coming from a supporters point of vew, if he would go to Counseling it would help a great deal. It's hard to watch someone you love pull away from you. It can cause anxiety, all you want to do is fix it. It feels like your losing someone you love. It's very hard on both sides. But it can help if BOTH sides understand how PTSD effects each other. I, myself understand this anxiety. When words tell you, "it has nothing to do with you but the action of being pushed away feel different, it can be hard and confusing. Showing anger isn't always about being angry. It can be about, feeling hurt, sad, helpless,ect.
But feeling angry in my opinion is easier. If you go to marriage counselling you can both learn, what is your emotions and actions and what is his emotions and actions.
Relationship are hard to begin with, we pick up on each other's moods, emotions,ect. We deflect on our partner what we feel. I think it happens in all relationships. Don't get me wrong, I understand where your coming from. These are his emotions, he needs to deal with them. But working together and understanding does lessen the stress. Sorry your going through a hard time right now, I hope you both work through this.