I understand. When things start going out in the open and others see what she is doing, she will have to deal with that. The kids will know eventually. It will make it real for her and will be a lot of pressure.
In my case: I will would not say it's mutual to protect her.
OM is still with his W and has younger kids. Tells my w he won't break up his family (upstanding guy - ha). so it's all sneaking around.
Me-45 W-44 S21, S18, D15 T-27, M-21 BD Jan 2014 PA revealed March 2014 In-house separation - April 2015 I filed - Aug 2015 She moved out Oct 2015