It taught me that all it takes is a moment for your life to change. All of a sudden, a person very dear to you can decide to walk away.

You fall ill, go to a good hospital, get yourself checked just to find that you are perfectly fine. It taught me not every illness is caused by malfunctioning of internal organs.

All your life checklist-good job, cool gadgets, perfect resume- becomes useless because you want that someone special to come back. It taught me being good at things doesn't mean you'll be good in relationship.

All someone cares for you is your parents and siblings. Looking at your condition, your friends may leave you alone for sometime, your ex's friends may fail to recognize you, your colleagues may give you personal space but only your parents will keep calling you to reinstate your faith in life.

I realized all those promises were never meant to be kept. All those dreams which were shared together didn't matter. All that mattered to them was their new life and their dreams. 

All great learning comes after "why me?" phase gets over. Life is about learning. I learnt many small things which shaped my perception and my life changed.