That's a shame... Here in NJ, a divorced parent is responsible for college expenses (even, at times, through grad school) although a married parent isn't.
I do think THAT'S a little cockeyed.
Nevertheless, people manage to get through school all the time without help from parents. It's tougher, and more work, but I think it's a good point that kids who help earn their education value it more.
You and your son have your work cut out for you, but it CAN be done.