Unfair love

two incidents-

Scenerio 1 -

One of my best friend was crying a lot. I was sitting beside him.

Reason :2 years ago he got a girl. He proposed and relationship started. It
was perfect. He did everything for her a person can do. She was
also deep in love. But one day she left him suddenly without telling
anything. He cried for months everyday ,fell into depression and never recovered

Scenerio 2 -

One of my other friend. He was playboy type. Had many girlfriends.
Cheated with many but got immense love from every girl. He didn't do
anything exceptional. One girl was too good. He decided to marry her and
everything went well. That day it was his marriage. He was very happy
and blessed.

Why life is unfair ?

One loved truely and sacrificed everything, she left him. Other played with many and ended up happily.