From my teenage years until my diagnosis last year at age 48 I am very well known for dumping relationships. I lost a marriage to a really nice guy, who let me completely trample him. I do not know in the slightest anymore what I was running from, but boy did I run.
It plays out something like this. The SO or friend and I have differences in opinion. Since I have an itty bitty set of friends, I wind up obsessing about some imagined extreme fight that comes up. I cut and run before they can run from me. They are confused. Icalm down, my symptoms abate because I am no longer around them, and a better perspective comes about. So I reach back out to the person. There is a make up time period, then the cycle starts over.
I moved out of my home, arranged movers, packed, and fled from my first husband while he was away on a camping trip. He came home to that. I didn't know how to tell him I was planning it and ended up doing that to him. As I write this I realize that I have no memory of where I moved. What I do remember is him letting me come back, just to have the whole thing happen all over again later. The THIRD time I moved out we divorced. To be fair, neither one of us knew we were dealing with PTSD. He let me do very harmful things to myself without lifting a finger to help. My illness got worse.
I am now 10 years into my second marriage and was relatively stable until someone broke into our home several times. I went full scale episodic again and was getting ready to flee again when my current husband managed to get me admitted. He didn't sit by and let it happen, he insisted on getting help. Our lives are forever changed, but I love him deeply for caring so much he took the hard road with me. I think my life is going to be a lot better from here, though the therapy work is pretty horrible right now.
I don't know if my cycle is exactly like what other PTSD sufferers go through, but I was amazed to learn that I was in big company with my behavior. It helps to know it was a symptom, though I still feel a lot of guilt. HTH someone.