You need to get to get in contact with your exposure group and plan how you are going to address it as a group
The usual is for the exposure group to apply PRESSURE, and to refuse to accept OM into their home... Not to accept your wife socially, etc...
If she wants to TALK to one of the exposure group members about hte affair as a shoulder to cry on then that may be acceptable, but most important is for the exposure group to have a FIRM and CONSISTENT MESSAGE
END the AFFAIR or you are OUT of our LIVES
Affairs are very hard to fight on your own.. you NEED family and friends to make it happen
Tulsa time made a post here a few days ago with a nice list of things to do when your spouse is cheating to brin gthem back
Look at that as well... You DO need to EXIT from the situation, but you need the friends and famly to apply the pressure on her...