I find it is best to kill my enemies with kindness. Even Don Corleone knew enough to keep his friends close, and his enemies even closer.
Like everyone has already said, he isn't worth it.
On a personal note, there is no harm in fantasizing about breaking it off in his a$$. It will provide some cathartic relief.
However, don't dwell on it. After 48 years I have learned it costs more (financially, emotionally and psychologically) to be angry than it does to forgive, forget, and move on.