You've received some wonderful advice. All I can say is that the more that he knows about CDing the more comfortable he will be with himself and you. It's very strange to think that the CDer can be ignorant about CDing, but that is often the case. I consider myself fairly well-educated, but I left myself ignorant of CDing for decades! Guilt can do that.
Learn all that you can, share your knowledge with your BF, and encourage him to research it himself. When ready there a lot of friends here waiting to welcome your BF!
Oh, and your BF has one heck of a GF!