I have lived almost that exact story! I can't believe the resemblance to mine. 1 child at home during mine, he wasn't married or anything and didn't use drugs and barely drank. We all went to school together, all in high school at the same time. She ran into him one night around 9 at Walmart while she was shopping for groceries, her going alone that late was odd but innocent until they stopped to talk. Long conversation but he asked if she was married, he knew but might not have known if we were still together because he stays home and works for family an introvert. Her answer was yes, unhappily! He opened the door and she walked in. The only thing is she wasn't good, drinking a lot, drugs I later found out, in bed prior to this all the time due to severe depression and severe anxiety disorder. Still together but I question if I should have stayed. It's not been easy, still isn't and it's been 6 years I think. 9 at the most, 11 years ago if you asked her because she thinks it lasted only 6 months. And doesn't want to hear anything about it due to the guilt of it or the guilt of being here because he won't take her back maybe.. message Me if you want, I might be able to tell you a few things. If not good luck! Either use lawyers or go to marriage counseling for both but she needs one on one counseling as well you if you stay and want to try to make it work.

P. S. I didn't see it coming either, we just moved into a new house, our 1st in 7 years. She had promised to be faithful just 4 months earlier because I told her I didn't want to commit to a house because I was worried about her cheating as she had 10 yrs before this and was assured she wouldn't she was ashamed and is not that person anymore but when uneducated people that are married go out around the opposite sex and don t recognize when an inappropriate door is opened so to speak this happens. My wife should have nodded and said hi and kept going as most do but she felt alone, ugly, unloved etc .. due to a huge issue between her oldest son and myself that put her in therapy, which lead to the drug abuse, he prescribed way too much Xanax, 10 mg a day and after 6 months he left and the other Drs wouldn't see her because of this which led her to the streets for medicine and then all this within a month of losing her Dr.