From my first marriage, and two kids, my ex was horrible in the process. Overtime she alienated the kids from me....Anyway, everything does move on....
My advice is just try to stay non-emotional even with the kids.... she is doing this and you have to be non-emotional.... just manage the project of your life now. Move the ball forward. focus on moving forward.... The kids will be best if you manage it non-emotionally. Even older people make mistakes and behave like kids.... If you can rise above, let her go, if you love something let it go..... so to speak, imagine being 70 years old... look back at where you are now. Behave like the advice you would give to your young self today. Maybe your W will come back some day and be truly remorseful or maybe not... but I feel if you behave in the right way, you will feel good about that, and in the end, that will help you. Save yourself the embarrassment and regretful thoughts you could have in the future, you know what to do today... Be direct, detached, non-emotional and move the plan forward.
H (me) 52, W 42 M 15 D14, S12 PA June and Sept 2016 Found out Sept, confronted Oct NC with OM since Oct, remorseful Dating since Nov