Unfortunately I would say just move on. Don't hold out on other opportunities just to see if you get this one internship. You are still young and there will be

Unfortunately I would say just move on. Don't hold out on other opportunities just to see if you get this one internship. You are still young and there will be hundreds of opportunities that will come and go exactly like this one. Even when applying for full-time jobs this a common scenario where you will go through the hoops of interviewing and then be left in the wind while someone makes a decision that does not involve you. It is not personal, it is just one of those things. Don't look at as bad, but instead look at it as you got the chance to interview which in itself is valuable as you move on your career. There were probably other applicants who did not even make it as far as you did so that is a huge plus for you. Keep moving and don't give up just because of this one experience.