First off, I would pray to the Almighty to help me be strong. Then I would hide my emotions and say nothing, thus carrying on as if nothing had happened. During this time I would get all my ducks in order and compile as much documentation and proof as I could. When the time was right, I would bring everything into the open to their chagrin.
It is important to know that cheaters will always deny their crime and unless you can prove it, they will continue to deny it and then go underground with their treachery, all-the-while claiming that you are crazy. This issue hits close to home, because it happened to me.
Revenge is best served up cold. :0)