My wife is having affair with a mutual friend

[KarenR]

I agree, this is a very difficult situation. I don't necessarily agree that "she is in love with him and very happy"...she might say the same about you. But, you don't want to continue this charade. I suggest you talk to a Divorce Busting coach as soon as possbile to get great advice on how to go forward. They are experts in this type of situation and will give you very specific direction on how and when to approach her, so that you are more likely to keep your family together. Ask me about a discount that we are offering now.
Take good care!