Sorry I was distracted when writing that. (putting foot in mouth) I responded because I can relate to this in many ways.
By all means, no don't just take the abuse. That's wrong for both people, it reinforces her negative behavior and destroys you at the same time. As a sufferer we can't hide behind that fact and abuse it. At the same time you can't blame everything on PTSD. It sounds like there are issues and manipulation going on beyond the scope of PTSD. I guess what I should say is with PTSD you will have things happen that are part of the disorder and you have to be ready for that. Not that you deserve it but its part of life with a sufferer at times. We all have to draw a line in the sand disorder or not.
By all means, no don't just take the abuse. That's wrong for both people, it reinforces her negative behavior and destroys you at the same time. As a sufferer we can't hide behind that fact and abuse it. At the same time you can't blame everything on PTSD. It sounds like there are issues and manipulation going on beyond the scope of PTSD. I guess what I should say is with PTSD you will have things happen that are part of the disorder and you have to be ready for that. Not that you deserve it but its part of life with a sufferer at times. We all have to draw a line in the sand disorder or not.