Hi Meridian, I know exactly what you are going through as I am going through the same, only I am the husband. I feel like our relationship is falling apart and I cant do anything to stop it. She has been pushing me away for some time now and I am getting to the point that I dont know how much longer I can live in misery. The hardest part is my child, I dont want to loose him for anything but as the laws go I probably will loose in court. The emotional toll that is building has been devastating to my health, and my head. I dont know if there is a right answer, but if you look into your heart you will know what is best for you and your children. Money wise you will survive, it may not be easy but you will survive. Just make sure that there is no way of rebuilding the love before you close the door on it.
Good luck everything will be ok.