Painter & anyone else, what brought your spouse back to work on marriage & end their affair, if you care to share?

Also, anyone worry about the mental health if their spouse? My W says she us thinking Crystal clear but her actions tell me otherwise.

Me44 WAW44
T22 M13
S10 S6
BD Aug 2014
PA Dec 2014;OM is divorcing,one D4, one S due Feb 2015 with Stbx wife
OM moves in with WAW Jan 2015
WAW file divorce Mar 2015
50/50 custody settled July 2015