Thank you, CMY for your understanding. None of this is easy. I've known my sufferer since we were kids and we've had a wonderful friendship and now relationship for years. He did acknowledge a few weeks ago that ignoring me and shutting down without warning is a form of relationship abuse, which it is. And I separate the behavior from the feelings; you can't help how you feel, but you CAN help your behavior. I have not heard anything from him and I did not try to contact him yesterday. I thought for sure he'd try to contact me this morning because it is a routine for us to talk or text first thing in the mornings on weekdays when we both head in to work, but nothing.
I know he also has a lot of anger in him that he's only just beginning to acknowledge, and I have a sneaking suspicion that his anger causes part of this, since it started with a disagreement between us and he said part of his turning off his phone was so he wouldn't say something he would regret later. A friend of mine suggested that he shuts me out as a form of punishment to me, and to him too, possibly. I don't know. I do know that he holds on to anger for a long time.
In the past I have always been the one to keep lovingly reaching out until I had a response from him. Not this time. I actually had a wonderful date yesterday and I plan to see more of him. Interestingly, he, too, is a combat veteran.
I really appreciate all of you who have offered insight as to this issue. I still maintain, though, that despite the amount of suffering a person has with PTSD, hurting others is not acceptable. I've said to my sufferer repeatedly that all I needed was a quick text, a few words, just to let me know he'll get with me soon or he needs time. Not just an abrupt hang up and the silent treatment for days on end. The pain of this all has been horrible, not to mention the betrayal of many missed dates, broken promises, and last minute cancellations. I am a very patient person and I have held on a long time. It may be that he just expects that to continue. It all comes down to boundaries and I need to do a better job of setting them.