Its tricky striking a balance between taking care of yourself, taking care of your kids and encouraging a WAS to not be a walk-away parent.
My ex does everything he can to make being a Dad more difficult for him. He also moved 45 mins away to live with his GF.
I dont do many things that I would like to do, like remind him that family friday is the first Friday of the month at the kids school - he is on the school emails too. (He has never made it to a family friday in 2 years)
But I do, do somethings, like have the girls call him after/during important events. I had the girls call him from Disney cause my exH never calls them on my cell (its really weird that he acts like if they are not home he can't reach them).
I think its important for the kids to have a relationship with him and just like you had be the better person and acknowledge the OW - its an ongoing process to keep WAS involved with the kids when all they want to do is party like they are 22.
Stay strong. You are an awesome mom and your kids know it.
---- M 39 H 35 D5,D4 M 4 T 9 ILYBNILWY 5/18/11 Left 7/11/11 Divorced 12/1/13