(((Lizzy))) Everyone before me is right IMO. He will not do it plain and simple b/c he does not want to and doesn't think he needs it at all. I heard Dr. Laura talking to someone today about "how she thought her husband would change after a while" and here is Dr. Laura's answer:
"Oh, so you married his POTENTIAL. Do not ever marry 'potential' because 'potential' is just YOUR fantasy and YOUR desire, it is not real."
That quote was a good wake-up call for me. This is something I've known, but somehow I don't think that this concept (duhhhhh) ever really stuck until today! Best of luck, but you may just have to let go for your own peace.