He has been speaking to friends about it and he has spoken to me, although he did say he hadn't told me everything yet...I am not pushing him on that, I will let him do so in his own time.
I am not too concerned about it as he is a good talker for a male! he also has a very close bond with me as he was very sick a few years ago and we spent a lot of time together.
Unfortunately have personal experience of PTSD with a close family member, so hopefully know the signs.