I think the sort you are thinking of is the sort that like to have their cake and eat it too.
Keep doing what you are doing. Stick to the facts. Don't waver. He is looking for attention from you adn he has ALWAYs gotten it in the past. Once he starts realising that he has to work and commit to the r'ship in order to get and keep your attention, he _may_ start acting differently. You have to be consistent though. i know it's hard, I am not doing well myself, but as we all know, it's so easy to see things clearly as long as it's not your own sitch.
*sigh*
Bloody cake eaters....
** Purple
As soon as you trust yourself you will know how to live. Goethe