Because I don't want to talk about it. What's the point? Bottom line is that she is in a relationship with someone else. I don't need to hear why she was lying. She doesn't need to know how i found out. Until we are working on the marriage why does it matter
Here is my question to you- do you want to reconcile or are you finished? If you want to reconcile, then why do you not want to talk to your W? Because every talk you have is a chance to show her YOU have changed. It's a chance to LISTEN and VALIDATE.
Frankly even if you are finished you should still let her talk because you have a kid together. You're both going to need to get past all the hurt so you can at least be effective coparents.