I would say move on, It is hard, break-ups are always hard. I understand he was honest with you, which is a good thing, communication works wonders and I can understand why you feel the way you do.
My problem with it, is that it seems like he is using his fathers death as a way to break -up with you, it is like a smoke-screen, he didn't want to hurt you but really wanted someone else.
I could be wrong though, good luck though!