Cutting off hair in ancient Asia (Japan, china, Korea & possibly some other Asian cultures) symbolizes being banished or rejected from their home. In the more modern age that is now, cutting long hair into a short cut means to forget the past, leaving the old and starting anew.
“The truth is that no one else could live your life. Nobody else - man or woman - could wake up and put on your shoes in the morning. Nobody else could pull it off. So own that. Cool is a lie. Cool doesn’t matter and it never did. Merely perception.”