The whole EA thing is such a mine field. My W was in an EA and she thought it was a friendship, etc, etc.
Basically, there is no winning. Some men would think since it is one sided you should not be concerned. Some men would realize that a one sided EA is counter to their marriage. It's a lose lose.
Don't interfere - that will cause blow back. You may want to consider some kind of boundary.
That's all I got for now.
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