he is the silent resevered type.
i have to force him too talk lol.
Find out what he likes to do (if you don't already know). If there are some things he likes to do (or does regularly) that you haven't tried (but would like to) - let him know you'd like to be shown/introduced to those things. If there are mutual hobbies/interests - try to share your time doing those with him.
Talking will be more spontaneous and vountary when he's in 'his domain.' Whether that be teaching you something or in the process of doing something together.
Though you may want to avoid things he and his ex used to do together - at least until he's healed.
That's one thing that drove a spike between myself and my ex - it was very difficult for us to have time to bond like that. It got under my skin a little - and she picked up that I was not happy (though I wasn't communicating what was wrong) - which probably fostered insecurities that fed into her decision to start fooling around outside of the relationship... which fed back into my own insecurities - and with a loop like that....
Just be sure to feel out the water a little bit. If he's like me - he's a little paranoid by nature, and his confidence in female integrity has likely taken a bit of a hit. He's going to see another girl making advances on him somewhat suspicous, and also be seeing you a bit like the guy his ex messed around with.
... Though it's hard to tell... almost all of my male peers that I have talked to understand a lot of the emotional phases I went through afterward - but quite a few of them are the ones that talk rather 'macho' and seem to go through girls like popcorn. Others don't talk macho and go through girls like popcorn, too.
Some of it could be age related... the older you get the more you're just like: "Eh, sure - we'll be boyfriend and girlfriend. ... Oh... well, not if you're going to act like that. Seeya." People seem to get a little jaded in that regard and are just happy to have someone who will humor a partnership for a while.