My Husband is having an extra marital affair with one of his colleagues. I had caught him before as

My Husband is having an extra marital affair with one of his colleagues. I had caught him before as well but then he promised he that it was a mistake and won't repeat for sake of the family. I had forgiven him and given him a chance. But I recently found out that he is still having relationship with her. I heard him talking on phone and was discussing about me telling me all bad things. I have also talked to her. When I first called her she was shocked and said no no I don't know him etc. But when I said u are the reason for the fall of my family then she was hearing quietly. He also has accepted to file divorce and have sole custody of my children. We both belong from Christian background. Let me also mention that my husband lives and I live in my mother's house. My husband doesn't give his salary details to me nor is supporting us financially. Therefore i have compulsion to live with my mother as she supports me and my children financially. I am also working in an NGO.