Before you act, resist the urge to retaliate out of selfishness and your own anger, and instead ask if the path you are taking is in the best interests of your kids. Are you taking the high road? If the answer is no, you might want to rethink your strategy. Divorce is hard enough on everyone - especially our children.
It's upsetting to have an ex-spouse continue fighting with you after your marriage is done, particularly when the ex-spouse is your children's co-parent. Taking time to think about why this is happening and exploring the possibilities can yield helpful information and lead to new ideas about how to stop fighting and move yourself forward.