I would be careful about making it, even with older kids, about "your mom is doing X". Keep it general. "SOmetimes people grow apart." "You cannot force anyone to stay with you." Etc.

Kids are smart. They are perceptive. They know who is making the mistakes and who is at fault. By the way, this is another reason it is a bad idea for the LBS to start turning to other people (IE DATING) too early. Kids will see that and think "wow, Mom started to step away from the marriage, but Dad was quick to run to someone else. Hmmm." I still don't know why people rush to dating IF they want to save their marriage. (RANT OVER)

The truth always has a way of coming out without the LBS outing their WAS.

M(53), W(54),D(19)
M-23, T-25 Bomb Drop - Dec.23, 2017
Ring and Piecing since March 2018