Ringing in on the trust issue... yes, trust is an issue for everyone with PTSD. It's like, the whole world seems so dangerous and crazy. Nothing holds still. Everyone seems suspicious. I like to joke that paranoia is the "p" in PTSD.
That being said, though, there should be a difference between PTSD trust issues and an abuser beginning to isolate you to control you. I guess one of the things I would ask (having escaped from two abusive relationships myself) is does he seem disgusted by you? Does he treat you with disdain or scorn? In other words, are the trust issues fear-based or anger-based. Does he seem to want to vent his anger by punishing you with control and emotional distance... or are there times he tries to reach out to you, even if it's in a crippled way?
Seems like a lot of people in the early part of PTSD have trouble reaching out at all. Everything hurts, and even being in the room with someone who was breathing would sometimes send me into anxiety and hypervigilance. But at the same time, I would still try to tell my husband that I cared about him. There would be anger and rage and emotions all over the place, but there would be times I'd tell him how much I needed him.