oh..it's so wrong of her..
I don't like to judge people, but as for Mom she is so much wrong! Even if you're the worst in the world for her personally, but you're their dad and all tries to make them be against you are so devilish and stupid...
I know what you speak about, because my native brother has a similar situation. He has 2 sons, and they are still not officially divorced and they live in one flat still with his wife, but they are not a couple for some years already, they just can't decide a flat problem (he is too kind and noble just to throw her away of HIS flat, she is their mom and he respects her though she spoiled last 10 years of his life-(( And living in his flat she still tries to make kids be against him! She and her mom do all the best to prove to the sons that Dad is bad, he has betrayed the family, he doesn't love them etc...
My brother suffered so much when they succed and kids started to trust them and be closer to Mom not to him, and only recently the situation has started to change, and kids have stopped to see an anemy in their Dad...
How stupid some women and some mothers are...
don't they understand they just destroy normal kid's perception of the life and the family? Their own egoism has won maybe...
Just be strong, you ARE strong I know, and your kids love you!