Maybe he just acted that way in the beginning of the relationship because romance is universally expected during the honeymoon phase, and then once he was confident that you were a "sure thing" he allowed his true colours to show...

If he's adamant that he's not the type, then there's absolutely nothing you can do or say to make him become the type. You either accept him as is, unaffectionate, aloof, low / no sex drive, unromantic, or find someone who's more compatable and can fullfill these relationship needs of yours.

You are not clingy for wanting to have intimacy and wanting to feel special / wanted within your relationship. We all have emotional needs and it up to us to seek out partners who will meet those needs. And when we've been mistaken / mislead, we have to decide whether or not we can live without these needs being met for possibly the rest of our lives.