I want my marriage back

I want my marriage back: Please pray that my husband would open his eyes to see the mistake that he is making in proceeding with the divorce which he started a week ago. He has been living with another woman for over a year now and she just gave birth to his child. He tells me that he no longer want to continue living in adultery and fornication and that is why he is choosing to stay with this woman who gave him this child. We do not have any children of our own because he already had 2 from a previous relationship and I also have my own. We were perfectly happy with that set up. Now his excuse is that since he is not able to see his 2 other children, he is not going to miss this opportunity in not being there for this one. I do want to save my marriage as I was betrayed even by the other woman who knew me.