Whether Christian or not cheating is the lowest form in a relationship. People are not perfect and make mistakes so in order to clear your already guilty conscience you should level with your wife and start trying to enhance your marriage. The problem today is many people would rather cheat than try to save their marriage. Nothing bad will happen to you because your conscience will haunt you until you straighten your life out. The grass is not always greener on the other side of the fence which simply means no matter what your relationship you get into will also have problems. Work on your marriage!