That's just so tragic, I wish I could explain his attitude towards you, but I have no idea what it is.
But my advice to you is this:
Get to know the girl through other sources (don't let him know that you know her)(and of course don't let HER know you're dating the guy). Examine her carefully: her looks, her attitude, in a word try to see her in HIS eyes. What is it that he liked in her? Of course you could start criticizing her and say, she's not worth him< and everything, but try not to do so. Look at her - is it her hair? Is it her sexy voice? is it her character? What's so special about her? I'm sure that afetr awhile you will start to notice some things. Guess what you should do now? Right, learn from her.
I hope this helps a little (of course if you would want to follow my advice). Actually, this is an article I read in Cosmopolitan couple moths ago
Hope things will work out for you.
I have it all. Including kino.