This doesn't have as much to do with your affair as she is allowing you to think. This is more about her feelings for the OM. The WAW always has a reason or an excuse of how you let them down. If it wasn't your affair it would have been your work, your lack of connection, your not helping around the house, etc. etc. etc..
When a WAW has another man they are interested in the excuses and blame game is endless..
This is about her wanting the OM. Your affair is an excuse. There are tons of examples of people having affairs on this site as we speak. Notice that most all of the BS's on this site are more than willing to reconcile and forgive the affair. She is gas lighting you to defend her own affair. Classic.