All Randall had to do was try to be superman to a fault. Do his politic thing. Be super supportive of Beth. Let her see him going all out. Be exhausted at home. Fall asleep at the desk doing the bills. Yet never saying a word about the money. Dip a little bit into the savings only so much that its noticeable.

Let Beth come to her own conclusions. She would see how hard that he is trying to juggle everything but failing (not up to his usual excellence). See that he is committed even to the point of failure of letting her live her dream.

Her love for him would not let him fall. She would come to some conclusion that was totally palatable because she devised it herself. Ultimately it would impact her teaching dance but she would be totally cool with it and love him all the more for it.