Hi Glara,
I am so sorry that you're going through this right now. Can I ask you the nature of your relationship? I mean is it more casual and in the dating phase, or are you two official a couple right now? I don't think its unreasonable to set certain expectations in terms of how often he is going to contact you and such. Of course, there are different degrees of shut downs and if he was going through a total shut down and contacting nobody, then perhaps he would deserve a little more leeway. However, since he is in contact with other people, then I don't think it is unreasonable for you to expect some sort of contact, either, even if it is just a "I'm ok, just not up for talking right now" sort of message. He may not be able to fully engage with you, however. I also go through periods where I am ok with friends and family, but don't want much contact with someone I'm seeing. In my last relationship, the basic requirement was that I continue to talk to him, text him, or message him, even if its just to let him know that I wasn't up to seeing him or talking to him. I think this was a reasonable expectation within the relationship. I agreed to it because I saw it as a basic form of respect. He was there for me, so at the very least he deserved to know what was going on and not be dropped without a word. I think it is cruel to just let someone hang on like that (unless, of course, the PTSD is severe and it is a total shutdown, but that isn't what we're talking about here.)