Like Amethist, I was married to my husband before PTSD came in to our lives. I stay with him because he is my husband and I love him dearly. If he lost an arm he would be my husband - just as if he looses his way he is still my husband. I cannot comment on people who choose to begin a relationship with someone who is already suffering - there may well be people out there who want to "fix" people but there are also a lot of loving and caring people out there who can see past the anger and the isolation and see the person within the PTSD and that is the kind of person that I hope you are lucky enough to have by your side.
I feel quite bad reading your first paragraph - my on line diary is one massive rant against my own personal situation. Please understand that things like that are a way for me (all of us?) to let off some steam in "private" eg not aimed directly at our loved ones. I do feel angry and I do feel resentment - at my husband but at the same time not at my husband. See - if I even tried to explain this to him it would all go horribly wrong! So I use my diary to vent these confusions and frustrations. I would never want him to know how I feel as it would hurt him deeply. It is not him that I am angry and upset with, it is the situation that I find us in.
I hope that this goes some way to answer your question. I am a big music fan - all be it with rather questionable taste :p and there's a Gretchen Wilson song that sums it up quite nicely for me. I can't remember what it's called but it goes like this:
I've never done anything ,That would ever bring a tear to your eye, I've never crossed the line, or needed an alibi to cover up a lie, But darling i'll admit, They're been times when i could have, The thing that kept me strong, Is the one thing that is always on My mind
When I think about cheatin', I just think about you leavin', And how my world would fall to pieces, If I tossed your love away, Even when i'm tempted by some stranger, Oh there's never any danger, I just think about you leavin', When I think about cheatin'
For me it's not cheating as in being unfaithful so much as cheating as in giving up on him. I really could not imagine my life without him - as hard as it may be living with him sometimes!!!!!