That's the whole point right there.
Its in the past.
Believe me, I know all of what you are feeling. Its OK.
What you need to realize is that spending time on the whys and reasons and wondering doesn't serve you one bit.
Try & focus on the future now and know that you can learn from this, get stronger and become that is in tune.
We tend to think that this is the end of the world, but really only the beginning.