How to help a guy open up?

Anonymous
I've been with this guy (24) for four months now. he dated the girl before me for years (4 maybe?), lived together and what not and she ended up cheating on him. this happened a year ago and i'm the first girl he has tried with since. we are exclusive and i know he is committed to me but we are not officially together because he admits he's scared to open up again. any advice on how to get him to open up? i would NEVER cheat on him in a million years and all i want is for him to open up and trust me so we can be together! otherwise he treats me very well.
Updates
+1 y
Also, from the start he told me he wanted a relationship and he keeps telling me it will happen and he wants me he just needs time to make sure this relationship will work out and he won't get hurt like his last.
How to help a guy open up?
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