Time and self evaluation of your value to any relationship especially the one with yourself. Cheating is typically the result of the cheaters insecurities.
A strong person just takes the heat of a relationship gone bad, owns their part in it's failure and accepts responsibility for his/her actions. You can in many instances save a relationship if both parties are committed to the hard work required, many others are not capable of that difficult path. My advice is to assess, evaluate and move forward with or without the cheater.
contact an ethical hacker who is a guru in all hacking skills, contact him via
[email protected], check his website to know more about his jobs and other things he can do
http://www.cyberking.strikingly.com/ 