It's strange that when time moves so quickly, you look back at it and feel you've learnt a lot more than what those four months could have taught you. In fact most of them are not lessons, they're just realizations. And these realizations help you to deal with yourself more than any effort to set things right.
Somewhere along the way, we all see - that it's not the world that is unfair to you, it's not people, it's not yourself - that's just how it is. No one's life is perfect. That trying to feel happier is not the answer sometimes - it is to be happy with the way you feel. That friends you're hardly in touch with are as much a part of your life as those you always talk to. And that when you learn to let go of the past, the future looks a lot more peaceful.