I was recently in a situation where someone went out of his way to make my life worse.
Why was he so malicious?
Because we were in a situation where he perceived that I was getting treated better than him. And there was no way to make his situation better, so he settled on making my situation worse.
And he was satisfied by that.
God, preserve me from people who want to make everything "fair."
As William Goldman said so wisely in "The Princess Bride"
Life is not fair. It's just fairer than death, that's all.
The sooner you learn that, the happier your life will be. Pinky swear.