Sadly, the stuff you describe is absolutely not uncommon to read about on here, but just because the behavior is symptomatic does not mean anyone needs to stand for it in a relationship if it is making them unhappy. I really worry some of our supporters put up with just so much crap because they see what the relationship could be without the isolation, without the lack of contact, without the depression, without the cold words.
Could I be with a blind man? Could I be with an amputee? Could I be with a paranoid schizophrenic? Maybe, maybe, and no. There is only so much I can personally cope with in a relationship, and there have got to be some hard and fast boundaries if I want to fulfill my needs for a productive, healthy, loving, and mutual relationship.
My partner is bipolar. I have PTSD. But we have some serious ground rules, and we don't push it. We cope with enough from one another. There are some things we have said we will not tolerate. Our illness has to work within those limits and boundaries, or it doesn't work at all. We have our ups and downs, but there are some things that all the "ups" in the world could not rectify. I would not stick around in a relationship where I felt that I was spending more energy than I would ever seem to get back, and I worry that that is where you are.
I am simply asking you to assess this from the perspective of it not being PTSD. What do you really need in a relationship? What can you not tolerate? What is unacceptable? What do you need to have fulfilled by a partner, and are those needs being met? PTSD is a disorder. It's like any disability or condition. Just because PTSD comes out of tragedy does not mean it should be placed on a pedestal. Sometimes it seems like supporters just take crap because "It's all just PTSD." PTSD is chronic and life-long. The odds that a sufferer will change over the long term in short order are essentially zero. It can be coped with and managed, and you can get better over time with hard work and dedication, and it is challenging, and there are a thousand set backs it seems, but nevertheless, it's a part of one's identity that will not simply disappear with enough love thrown their way.
Your avatar sort of sums up my concerns. I gravely beg to disagree. Maybe that's some facet of love. But a relationship, in any case, is more than love I think. It's also trust, respect, and a willingness to give of yourself for another--even when it's difficult to do so--to maintain a mutual connection.