Wife in love with another man, I need help

[Jonpen]

Hi guys,
I'm new here. I had previously been trying the Marriage builders techniques for 2 months with NO results. Here is my situation in a nut shell and I'm sure I'm leaving something out. me and my wife were having marital problems. I was rude, criticizing and mean to her because she would always fuss, nag and be rude to me, so it became an endless cycle.
We still did things together and had fun together as a family (We have 2 kids together, a 4 year old boy and a 2 year old girl) We were still intimate, but we rarely did anything together without the kids.

So she meets a guy at work and he is also having marital problems. this is no surprise he is 10 years older than her and has been married 3 times. He has 2 kids from 2 of his marriages. I am 27 my wife is 23 and he is 33. So they began talking about their problems together and started being there for each other. One thing lead to another after 2 months and she fell in love with him and had sex with him.
I know they only met up 1 time for sex because I found out through a keylogger and they talked about how much they wanted to do it again.

SO I read up a little on plan 180 and thats what I'm trying to do. I could use any advice and help you all can offer.
Thank you.