My wife had a brief emotional affair about 10 years ago. There was a lot going on from lack of money to kids to me not doing my share of family stuff. Whatever she tells me she wants to basically start dating the husband of a good friend. All the typical affair stuff. Sneaking around. Hidden emails. Etc etc. I found the emails only a couple weeks into it and blew it up with the other wife. That ended things quickly but the resentment lingered for a long time. We did lots of therapy and came to a new understanding. But to this day I’ll never blindly trust her again. In most ways we are in a better space because I probably never should’ve been so trusting. It’s all good now but it was hell for many months