I'm certainly not at the "wishing her all the best and (sincerely) hope it works out with OM2" point like some here.
BL42 if you follow my posts you will know I am not a fan of posters saying you "need to detach". SteveLW use to say "I don't care if your W is getting ganged banged by the football it shouldn't effect you" I would think WTF????? Full detachment is very difficult and I am not sure if anyone ever gets there. If you follow the "other side of divorce" thread there is a guy who has been D about 5 years was checking obits because he is wishing death as karma on other male. So don't beat yourself up and try to think about what is in best interest of your children. You are human and certainly never have to wish happily ever after but you also don't have to wish death of OM. Maybe somewhere in between.