I'm late to this conversation, but as a supporter I would like to give some input from the other side whose boyfriend who is a sufferer disappeared. I love him deeply and tried for 2 weeks to reach him. If he came back to apologize I would take him back in a second.
I think it depends on how she handled things after you left. Did she try to salavage the relationship? Was she aware of your PTSD and showed a desire to learn and understand?
I tried to let my man know I was willing to do whatever I could to understand and support him. Even though he hurt me deeply, I only showed love and kindness when I tried to reach him. I understand a relationship with someone with PTSD cannot be compared to behaviors in an average relationship. My leeway is so much wider with him than it would be with another man.
So I guess what I'm saying is please reach out to her if she showed any signs of wanting to work on things with you. We woman love yo, and the disappearing acts are so much harder on us than a breakup with closure. If you find someone who wants to walk with you on this journey, do whatever you can to hang on to her.