Why shouldn't you be angry? I would be, and if we are all honest, so would everyone else. It isn't fair at all!
Acknowledging your feelings and venting in a healthy way (like coming here) is the best way to deal with your feelings.
However, as the others have said, karma will get him. He will find his bottom and the fall will be all the harder for his temporary good fortune.
Just my 2 cents.