Do you realize what has happened has happened, and no amount of finger-pointing can change that? Instead, direct your attention to all the positive and valuable things you can do.
Understand how much more satisfying it is to put your energy into moving forward rather than looking backward. Even when the situation is not your fault, you can take responsibility.
Beginning today, there is little to be gained by pointing out what is wrong unless you begin to take positive action. Why? There is no limit to the real progress that you can make in your life.