WIY: There is ZERO basis to assert a Kollel yungerman MUST “sacrifice” if he doesn’t have to.
gavra: Huh? Are you kidding? That is no basis for divorce!! If a F-I-L doesn’t want to continue support, there is nothing forcing him — other than his word of honor, if he promised that. But barring any pre-marital commitments he made, he is under no obligation. He is doing it out of his own free will and the goodness of his heart.