Just throwing my two cents in here ... you're very much in/was in honeymoon stage, which is a stage when you meet someone and everything is glorious and wonderful and nothing seems like it would ever go wrong, you live in this dreamworld, all these hormones flying around and it's bloody wonderful, bloody bloody wonderful. THEM BAM.
Naturally you want to believe everything will be all fine and dandy, and I understand where you're at now, trust me I've been there. You tell yourself that waiting, being there for them, showing them you care, being patient and understanding will mean they will come back and reach out. Yes they usually do, but they also usually shut you out again, and the cycle continues. Each time is as harrowing as the first, for me it did get easier because I knew I was doing the best thing for him by leaving him alone to sort himself out.
This doesn't however stray away from the fact my 'friend' is now in that wonderful honeymoon stage with someone else. 8 months of my life doing the waiting, caring, understanding, caretaking for him to pie me off for some snaggle tooth, lanky haired, twig legged, scab of a human (only joking she's actually beautiful but it helps to pretend she looks like gollum). What I am trying to make you aware of is that he can tell you 'all these things he would never tell anyone else' he can tell you he loves you (just like mine did - several times) but you never truly know if that's the case. You're so very early in your relationship you really need to look at all possibilities now and wonder if you can do this ... several times over. It's exhausting, and if he's shutting you out now so early on, it's very likely he's going to do it again and again.
My work performance faltered because I was constantly on this site looking for answers, answers that don't exist by the way because no one is mystic meg, if you are DM me because I want to know when the heck my prince charming will turn up and if he exists, oh and next weeks lottery numbers as well while you're at it.
You can take comfort in the fact other people are going through or have been in the same situation, some have success stories and some don't. It's up to you what you want to do, but just be prepared for this, it really is exhausting, sufferers of PTSD really have it rough and it's a wonderful caring act to show love and patience, but don't put your absolute everything into this because you will end up just as broken. Live your life, be happy and be well.