Humlun, this is like a stick thrown in the bicycle spoke. All plans seem to be put to a halt. So what do you do when that happens? You remove the stick. In this case, you remove your son’s financial dependence. Let your son work this out with his father. They will find a way, and if it means it may take your son longer to complete his schooling because he needs to work on the side.
I’m sure no one expects you to sacrifice your own financial security. Yes, I would keep out of it, and let them solve the problem. They will.
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As soon as you trust yourself, you will know how to live.
Goethe