Why cant we be like before?

Forgetting everything when things go bad,

Why is it necessary to be angry?

Cant we for once forget what happened and live a complete day or days as if nothing ever happened...

Similar to the way we delete whatsapp messages now-a-days and pretend we never wrote it ever...

Why cant we behave the same again?

Why envy, why ego, why arrogance hovers upon us, when we are drifting apart

why is it difficult to part ways normally even after what happened rather than punishing ourselves by being sad or depressed instead of being cheerful, peaceful and happy like before...