It often happens, sometimes and for different reasons we come to wonder if we were called to do what we do, mostly when things are not going so well, or when we are exhausted, but then things like what you experienced with your students happen, this motivates you and helps you understand that you are doing your part and you are on the right path.
Cheers, excellent story, you are in the right place.
RE: Teaching Internship Diaries in the Philippines: Is this really for me?