All I can say heatherfeather is you are not alone in this right now. You've take the words straight from my life right now. The struggle of what we go through in our relationships with our partners with PTSD is not stuff we would tolerate in a normal relationship. I am battling within myself of determining when I should speak up and when do I just need to give him space. Your partner appears to needs space, but might not be ready for a relationship if he is not getting help or at least acknowledging he needs help. There has to be continued growth and an awareness of what he needs to work on, otherwise the relationship chaos continues as is.
I don't mind my partner's need for space and his need to shut out the world. However, am I okay that this includes me? Are you okay that this avoidance includes you? To me, it seems the need for space is part avoidance, testing, and poor relationship modeling that this continues on his end. If I bring it up, he is just going to deflect and blame me, but if I don't then I'm not sticking up for myself. As supporters, especially as I've seen on this forum, have made extra efforts to try to gain the tools to be supportive partners and better understand what our PTSD partners go through. In lieu of these extra efforts, we work on ourselves and try to build healthy patterns in the relationship. When it seems the foundation of the relationship is falling apart due to the avoidance and lack of communication, then the walls are unstable and it is a waiting game when it will fall apart. How do you keep a connection when there is no connecting?
As everyone has said before (doesn't make it easy though), you need to "do" you and continue with your life. I wish you luck and send you a big supporter hug!