I did ask him a couple weeks ago and he said 'of course I want to hear about the kids' but I had a feeling he said that more so he wouldn't sound like a jerk for saying that he didn't (can't bear the guilt) of hearing about the kids.
That's a tough place to be Busting. He was the one that left. Is it his responsibility to find out what the kids are doing? Is it your responsibility to tell him?? It's got to be tough watching your children not have a relationship with their father. So... what to do?? Do you try to fix it?? Do you just love your kids and provide them the best most stable life you can?? He has a responsibility to be a great Dad, not a frigging jerk. (just my opinion mind you)
What if you took videos and pics of the kids for you and when he is ready he can see what you have done, maybe even make him some copies and when he wants he can have the copy.
You can not change your past, but you can ruin a perfectly good present by worrying about the future.