Just keep on hanging in there, I've seen cases in which they go through divorce to then turn around and remarry. I've experienced some of what you are going through. God also did a miracle in my marriage after years of praying for my husband to come back to me. Everyone used to tell me he will never come back to forget him, yet God answered me and he has turned his life to God. Now we are happier than ever before, that's without us having any children from our marriage, how much more a man that has children with you. Don't believe the lies of the enemy, just live by faith and do not look at what the devil puts in front of you. Try not to fight, nor ague with him, nor push too hard. Let God be the one to touch his heart and do the work in him that we are praying for. Keep on clinging to God with all your might and the enemy will have to flee from everything that concerns you.
Lord continue to be with this woman, give her strength, comfort and wisdom, in Jesus name I pray.