Bless your co-parent just as they are. Let go of your expectations about co-parenting. Then parent as best you can. Release everyone, even yourself, from the expectations and dreams you had of a wonderful co-parenting relationship.
Anger is energy. Learn to deal with it and channel it towards something you want. Any anger directed back at your ex is anger that will return to you ten-fold when you are in dire need of support. So a prayer. Our kids are a gift. My ex is blameless in her journey forward, and it is in my best interest to support her and the kids with everything I've got.