New Men support groups growing
Understand that you now have the answer to whether you wife is the cheating type.
Two options for today's new man:
Stay with her; which is showing her that there is no penalty for doing it. Then wait for the next time, which will certainly be in your future or live with the memories until you pass away.
Listen and understand: Be hurt,betrayed,and sad that she ruined the relationship built on trust. Talk out you feelings with her to get things out for both of you. Then tell her you understand her explanation, you still care about her, and accept what she did. Then tell her you hope she understands now, just like she said she did when you got married, that you can not be with someone that you cannot trust. If she "learned her lesson" or "mistake", remind her that now she knows the consequences, when she finds someone else. Then offer to help her pack.
Shocked, such is growing as the penulum swings in the opposite direction. Too many "you will forgive and forget sites, books and advise out there" rather than I want to hate, have my cup of tea, revenge etc.
Oh FYI, women groups also growing.