Look, the bottom line is that this behaviour of his bothers you, and i think there is a trust issue here. he said he would stop, and he did not. You are not alone in your feelings about porn. For two people who agree on it, while I will never like it, whatever floats their boat. But you have clearly indicated that it hurts and that it bothers you, and yet he is still viewing it even after he said he would stop. That is where I see the problem. I hope you find your answers. For me, and I am not PTSD and I don't carry the burdens you do, I would find it to be a deal breaker. Your fellow seems to have many other good attributes, but how can you feel safe if he basically is hurting you on purpose? It seems tome it is more than just the occasional viewing. He may be addicted, and that possibility needs to be gently addressed. I think a few joint counselling sessions would be the best way to go. My heart is with you, it is not easy :(
As for EST, I am no expert on it, but it seems to me you are wanting to try and use an external means to control and invalidate your own feelings. I think there may be more problems in your relationship than you are expressing, but no person should make you feel this way. Hugs.