I also wanted to say.......

A 'Carer' may need to accept that the 'Sufferer' may not always be available but a 'Sufferer' needs to learn to try and verbalise this somehow so the 'Carer' can understand. Some of what I have read here refers to a 'Sufferer' just checking out of the relationship, which I guess is fine if that is what they need to do for their illness, but they also have to be fair to the 'Carer' and tell them it is due to the PTSD so a 'Carer' has an understanding. A relationship is a two way street.