mermaidgirl,
It certainly sounds like you made a very smart decision removing yourself from a romantic relationship from this man. I do not think he is able to provide you want you desire from a relationship.
However, he must see some great qualities in you. He trusted you enough to confide this big secret. Maybe you can just be good friends to one another -- and nothing else -- sometimes that is so much more!!! I dated a guy for 5 years, we lived together even. We wanted different things and moved on. To this day we are great friends. Even were invited to one anothers weddings. Sometimes there is just a lot more value in a friendship.