sorry to hear abt your martial plms. You may want to check out website on saving marriage and read the info. on it. There are other couples who are dealing with cheating among other issues on the forum and I think that issue was covered in the website too. The counseling services is provided (with fees) and free forum, books and other things. Check out Divorce Busting® - Solve Marriage Problems, Save My Marriage, Save Your Marriage, Stop My Divorce, Stop Your Divorce
I hope this helps and take your time figuring out what you want to do--give your marriage another shot or let it go. You may want to ask your wife why she did it and there may be other plms in the marriage that lead to it--it takes 2 to make the marriage successful unless your wife have sex addiction which is a whole another animal to deal with.