Divorce is not something you just "get over." And with kids, you never really get over it. I am learning to continuously forgive and forge ahead with my own life as a single dad.
I may not reach serenity with my ex-wife and her new husband ever. That's okay. The serenity is within me. I am doing, have done, and will do the best I can to support my kids and keep my relationship to them above the fray my ex continues to keep seething around us.