Hi. I don't think you owe anyone anything Humlan. You need to take care of yourself and protect your assets. Let your son and his Dad figure it out, and please, there is no need for you to pick up the slack. This one is not your responsibility as a mother. Really. Not everything is yours to hang on to. Let go. Up in the air, out to the universe. If there is ever a next time, I'm with Lola, get it in writing, like a pre-nup.
Orchid, here in the states there seems to be a trend toward children expecting parents to pay for their college. On the other hand, kids are graduating with 60,000 dollars in student debt, for example.