As non-sufferers we often think things like, "it's been two weeks, hasn't that been enough?" Because we think about these breakdowns in terms of what it's like when
we are overwhelmed: we get away from the source of stress, we mellow out. But that does not seem to be the case when it comes to untreated PTSD. It's not a mood you're waiting to pass, it's always present.
Even when things were going great between you two, it was still there. But when it's a new relationship, the symptoms can be tamped way down by all of the love and excitement. I wonder if that's why there are so many stories on here of fast-burning relationships that feel like once in a lifetime kind of loves. Sufferers thrive on those feelings because they provide a protective layer between themselves and their symptoms. But when that newness fades, the symptoms are still there. That's what you're seeing right now. (Any sufferers reading this, please tell me if I'm way off base here!)
It is not just space he needs, but he needs to avoid anything emotionally charged. For better or worse, you are associated with strong (positive) emotions. To us, these emotions feel good, feel supportive, but to a sufferer they can be a huge source of stress. And when someone with PTSD becomes overwhelmed with stress, it doesn't feel the way it does for us when we feel stress - it feels like fatal danger. If you haven't already, read the
PTSD Cup Explanation.
And to understand why, even when his stress cup stops overflowing, he might still want to avoid you, check out this one:
Why People With PTSD Use Emotional Avoidance To Cope
Feeling like you are someone to be avoided hurts like hell. Being pushed away really hard when you didn't do anything wrong is mind-f*cking. But you have to remember it's not personal.