Not able to have a baby???

My husband thinks he may not be able to have kids because of a groin injury two years ago. Because this makes him sad and he wants kids really bad, he doesn't want to talk about conceiving or kids.  He would be the happiest husband alive if we were to conceive and we have talked and decided we are actually trying but it's hard for him to loosen up.  Any advice? It's difficult because there's so much to learn about conceiving and so much excitement to share. This should be a happy process!!:(