Thanks for your input everyone! My partners childhood involved violence and neglect, to the point where he was removed from his parents. He then went into special ops, was married for 20 years, this ended when she cheated on him, and he reacted by moving to a different state from all of his family, including his children. We recently went for a happy family holiday (!!) to meet them, and they set up a devastating situation which ended up causing a huge rift between my partner and I, and resulted in the children and I leaving. This seems to have been the trigger for the PTSD, and since then , Greg has been completely closed off, hardly communicates with me, has put a secret password on his phone, doesn't tell me that he loves me, but when pressed, says 'of course i do".
He finally admitted last week to needing help, and has been seeing an army psych pretty much daily for the past week.
There seems to be some improvement. He is talking to me a bit about his feelings, initiating contact a bit more, and yesterday when I was unwell, left work to come and care for me, when my mother could easily have.
It's very difficult when you love someone so much, and they shut you out. I hope one day he feels safe enough with me to trust me ...