God, how is it that MLCers can be so selfish and crazy and not have a clue how horrible they sound! I got all that praying but so far my W hasn't left but plans to soon. They really believe that "things" can make them "happy" I think because they are so afraid that if that's not true, they are the problem and it's to hard to look at themselves. He is hurting his kids by his leaving, not leaving and yet can't find it in himself to care. My W who had her parents go thru a bad divorce, swore she would NEVER put her kids thru that but now says "we all hurt our kids, they'll get over it".
Try to remember none of this is about you or how good or bad of a wife or person you are! I know that doesn't help much right now but none of this is your fault. He is so selfish right now, he is willing to let you and your kids pay the price for his "happiness"! Try to detach and give him as much space as possible right now. Show him you can be strong and will have your own life with him or without. Try not to show how hurt you feel, that will just feed his need to run.
We are all praying for you and your kids! You are not alone!