In this Cruel World

People used to be very kind and nice to you when you're in good conditions.
To make it simple, when you benefits them, they'll always be by your sides until you're not capable to do anything for them.
This world seems to be colorful and wonderful when I was a little kid. But as the days goes by, lots of things I've learnt. By observing things and those people in my life, it seems this world is not as beautiful as I thought before. Or maybe It never beautiful at all. The colors of the world faded, slowly becoming grey and became dark eventually.
I just don't understand, why people can be so selfish. People often take everything for granted, they will never remember who sacrificed for those happy moments.
Being so selfish and realistic tends to become a norm in this cruel world.
What an awful scene.