I'm not sure I completely agree that PTSD does not make you violent. I think PTSD can make a person with the pre-existing inclination for violence more violent- which is sort of what they're saying anyway.
Ditto. As someone who has a mental disorder, if you are already a hot-head or prone to solving issues by raging to release tension, than any mental condition can be the catalyst to push you over the edge. However, in the "sane" moments, that's when you have to seek help. What most people don't know is with every cycle of abuse, the phases get shorter and shorter. It's like the law of inverse proportions. The longer you stay, the more frequent the abuse becomes.
Him having PTSD isn't the issue at hand. He refuses help. That's the issue. Whether it's PTSD or not that is a factor in his behavior is irrelevant. He's hitting you. He's calling you names. He's raging at you while your pregnant. What in the world makes you think that if you just "love harder" that he will do better? I know the victimology of abuse...and I know it's not your fault. You can't take ownership of him. You can take ownership of your situation and that of your unborn child. Let him leave. Get into counseling and get emotionally healthy. Keep him out of your life. If he wants to get help and get better, he'll do it because he wants to. Nothing you say or do will change that.
Sorry to be such a downer, but it's real life out here. I wish you luck and blessings on this journey. And keep posting. Much of what you read here will be of help.