It is not our job to fix broken relationships or broken people. Our job is to show up in the arena of a relationship and do the best we possibly can to love and be loved.
Co-parenting is a cooperative relationship. When one of the partners decides to be uncooperative it changes the dynamics. However, as a positive parent, you can be the bigger partner. Choosing the positive is about every aspect of your life, and your kids are the most important relationship you can manage.