<p>If I were you, I would try again with the director when he gets back - make a personal case for why you think Caltech would better for you. You don’t have anything to lose, and you certainly shouldn’t feel guilty about waffling. This isn’t anything like a date - schools don’t have feelings, and if the director of admissions feels personally insulted that you wanted to go to MIT, then he’s a moron. I doubt that this is the case. Good luck whatever happens.</p>