So here's what you should do. Say to yourself, "agh man, he took my money and smashed up my car. I feel really let down." and then say to yourself, "well, it is what it is." Because that's all it is. It is, what it is. It's a bunch of notes and a bunch of metal. It may be important to you; but it's got nothing to do with the life you have with your friends and partner and Aunt and Uncle and gym buddies, nothing at all!
OF COURSE, you are angry about what happened, and of course, you've been done wrong by someone you trusted. But that was as true the day it happened as it was six months later when you were still telling the story, and still arguing with yourself in the head.
"It is what it is," means a) I'll go and get my $1000 back and extra for my car, or b) I will forgive him and move on, or c) I will forget about it as it is in the past.
That is all you need to do. By repeatedly telling the story of your injustice, to yourself and to others; you only strengthen the unhappiness in you, it serves no actual purpose. So why torture yourself?.
You failed an exam?
It is what it is.