Your sit is awful and I feel for you. The EA is a no win sit. You need to stay clear from it as far as you can. No matter what happens it will blow up. My W started an EA. I suspected it was a PA, I pushed and pushed her to see if she was in a PA. She denied it. So I snooped - then asked again, Still no. Then I deceived her and manipulated her to expose it. She finally admitted it was a secret friendship - she still does not see it as EA. I contacted him and told him to not stay clear from my W (no threat - Just that it was not cool to have a secret friendship with a man's wife). He agreed and dropped her like a stone. No everything is a disaster.
Do what you can to stay clear of the EA. The people here would say the best strategy is to make yourself more attractive or see what he would be missing. It's hard to do when you are hurt. I hope my experience can help you.
BBiz
P.S. I continue to pray for you
M:50 W:53 MR:20 D:21 S:17 S:11 BD-Sept 2015 Suspected PA Sept 2015-Confronted W & OM Dec 2015 Actually EA In house Sep:Jan/16-May 2016 W moved out:May 22 2016 OM-Intro Oct/17-On scene July/Aug 2017