In my experience, it will alwaysbe up and down. You just have to weigh up whether the ups are worth putting up with the downs! I know how you are feeling though and I wish I could say something positive but I just cant. It is hell living with them at times but then when they are having good days it doesnt seem so bad. From my experience I know that my partner cares a lot about whether he is making me happy or not, I think it is a common problem for PTSD sufferers.
I just thought of one thing that may be helpful... When I was at uni I did social work as an elective one semester and I was told that people will often push away the people who love them most simply because they know howmuch that person loves them. I know it doesn't make things better but it may help to understand a little bit about how your partner is acting. I hope things get better for you both. and if and when he is actually diagnosed with PTSD I a sure you will learn a lot about communication and how the best ways to approach things are... Tammy