Right now I would go with the flow and let him work things out. As he gets too know you better, comes to trust you more and learns that you are not going to hurt him he will unpack his own baggage with a little of your help.

My H was very closed off and unwilling to show emotion when I met him. I just let him be himself. We did things together and spent time together but there was no pressure from me. In a short while we were spending more and more time together, he was opening up and he learned to love and trust again. We have been together a long, long time and he is a totally different man. He just needed time.