Guys, How do I fix this problem?

Let's start with the root of the problem
He was raised without affection

All his past girlfriends were skanks
I'm literally his first REAL relationship
And now that our relationship is starting to get serious it's made him distance himself because he don't know how to take everything... I've come to far to give up and I've known him to long to quit now
I've never had a relationship like this
So guys I need to pick your brain how do I solve this and get him to open up without pushing him away?
Guys, How do I fix this problem?
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