I have PTSD, so I am speaking as a sufferer.
When i met my DH, I was already 4 years in my abuse (I had not gotten out yet those who wish to know can read my diary) anyways, I already exhibited PTSD signs but of course didn't know they were there. I was always going blind at the time (it was a close call but I'm ok now). I had nightmares, obvious trust issues and scared of intimacy (due to the abuse- altho I didn't make all these connections...just thought, "Well that's how I am")
I was very upfront with my DH about my going blind and he told me (later after getting out of abuse) that he had seen some signs of abuse but couldn't pin it. I asked him and at times still do, why he stayed with me knowing that I was messed up.
He told me that he stayed with me because he loved me. And because he saw what I could be after my healing and that he didn't care what I had to go through that he wasn't leaving my side.
I know that with the PTSD, there have been some hard parts in the relationship (such as intimacy as well as dissociating all the time). but I think we have been able to be much closer because so much of eachother has to be shared to be able to have great communication and a relationship in spite of the past.
This is what my DH said, I know not every person will think this way but I am grateful for him and for staying with me despite everything.