Not fair

It just doesn't seem fair. The emotional burden is not fairly balanced between both parties. And what is almost always the case, the one party is completely unaware, most likely oblivious, to the suffering of the other.

Why does it seem that we are built this way? Why do these things effect us so much more deeply than it does the other person? Why is intense sadness almost always followed by extreme anger?

I don't understand any of it. All I know is that it doesn't seem fair. Not fair at all.