He's a coward.
I am dealing with the same situation. I am still in love with him and I know he is still in love with me. What I don't know is why we are not still together and it hurts a lot. :'-( My heart goes out to you as I definitely understand what it feels like to not know what really happened. :-(
You are too good for him...he doesn't deserve you
sometimes there isnt a reason love just dies and thats the ball game
either that or hes gay
Would knowing that it was your boring personality or your insufficient cup size make you feel any better?
It might be for the best as in my experiences I have been given reasons for why I was and they were all stupid as heck. Or the reason itself was clear.
Then if you really feel the need to know try and find out and if you can't well sorry can't really help there xP
You need to ask him this question.
In time, you will know. If not today, then in time. Have patience, even though it's hard.
Did/do you truly love him?