I guess my rambling questions are these: Does this happen to everyone? Did I just pick the wrong person to be with? Are there people out there who I can trust with something like this? Are there people who can struggle with me and still think that my good qualities are worth that struggle? If it does happen to others, did it make your feelings of shame worse?
It happened to me. I doubt it happens to everyone.
I also think chances are generally higher of things like this happening when challenges are in the mix, e. g. PTSD and/or other disorders/disabilities... Point is that it's difficult for people who have not lived through trauma and developed PTSD to find a partner who fits. Even if they have no disorder/disability/whatsoever.
Today I watched a tv show. A 24-year old woman was interviewed. She had recently lost her best friend who died. She said that that was by far the worst and the first death of a loved one that has ever happened to her. There are people out there who were lucky enough to live through only few or no traumatic experiences, and they have trouble finding someone, too. So, when "we" (I am also a sufferer) go look for a partner, we don't only need one that fits (personality, looks, whatever you consider important) but also someone who can deal with the PTSD. I think that makes it more difficult, also once in a relationship.
I think you didn't pick the wrong person as I believe there is no such thing per se. You can never know in advance if a person is the "right" person or the "wrong" person. People change with time and circumstance. They change with experience, hormones, and so many other things. I knew a couple once who had been together for ten years, not married. The man was an actor (theater) and one day a new colleague of his joined the group. The man fell in love and left his 10-year love after one week of knowing his then new colleague. Only looking back can you judge somebody was "the wrong person"... A negative outcome, no matter how painful and devastating, does not make the initional decision a wrong one.
Are there people out there who you can trust with "you"? Yes, there are. It's been very difficult for me to find one, but I am convinced they're there.
Did it make my feelings of shame worse? For some reason that I do not know, I have had little shame, always, although I do have a long trauma list. What it did do though was make my feelings of abandonment, of unworthiness, of not belonging and not being loved and not being allowed to love worse. It's those different levels of pain I struggle with most (among some other things) today.
I am so sorry this happened, ASH. I sense a lot of pain and desperation in your post. Please be as kind to yourself as you can possibly be. You deserve to treat yourself with a lot of respect, care, compassion and love.