I assume BU’s early options and dates imply that this applicant applied early decision. I did not see that in the post. I would also like to know the state school as more of an FYI.
Anyway, CC active participants seem to have had many more positive “i can’t afford it” broken ED experiences than I have witnessed. Be aware that they often go badly for the family, so it is much better to stick with your commitment and attend the school you said you would.
In other words, you need to go to BU. The jewish population and activities will exceed exceptions.