I'm going to take the prize money
Why are you taking something you didn't earn?
He must've cheated. I never lose at that game.
Taking something that doesn't belong to you makes you feel entitled to something you didn't earn. You should always give credit where credit is due and not take what isn't yours.
I was cheated. It's all his fault anyways.
Are you sure he cheated? You must have proof of someone cheating before accusing them of such things.