My husband got another woman pregnant twice while married.

I’m looking for advice, relatable situations and some guidance as I have no one to talk to about the situation. Long story short; been with him for a very long time and have 3 kids together under the age of 10. Our relationship seemed wonderful, best friends, lovers, no issues, honest and faithful to one another. After I had my 3rd child, 1 and half years or so later, found out, on my own, he has been sleeping with a woman. They developed a relationship, saying I love you and whatever else to one another. She has 2 babies by him now. He is a great father and a great husband, please know that. He showed great remorse and fought for me to stay. I stayed for the sake of my children. I can’t bare the thought of them having 2 homes or how they would deal with it or feel. I’m unhappy though. I fantasize myself having my own home, single mother, with just my children and I don’t see him in my future. We would split custody 50/50 of course. Like I said he’s a great father and I wouldn’t take the kids from him. I’m asking, how do I do this? How do I tell him this and follow through with leaving? He will cry. How do I break it to my children who think nothing is wrong and their parents love each other? It will break their hearts. He loves me but I only love him as the father of my children and the husband he was before he cheated. But my life goal is to give my kids the best life they can possibly have. I don’t know what to do. Do I just get over it and act like nothing ever happened for the sake of my kids? Or move on break their little hearts?

Edit: thank you so much for the responses and advice. If I decide to go forward with leaving him; do I be honest with my kids and tell them why? If so, how would you tell them? I don’t want them to have hatred and I want to make it as easy on them as possible when it comes to understanding and setting an example.

Edit: i want to thank all of the ladies who commented and you all gave me wonderful advice. I don’t know any of you but it helps to have this kind of support when I have no one else to really turn to. I think I made my decision to leave and it makes me very nervous. I’m going to tell him that I’m unhappy and I can’t get over what happened and I need to leave for my own happiness. It would be so much easier if he had a “whatever do what you want” mindset but i know he’s going to make it hard on me with the tears and the begging. Just wish me luck please.

Update: I couldn’t do it. I tried and he started crying and I just couldn’t do it. My heart is too big and I always put others before myself. I just don’t have the balls to do it I guess. I just don’t know. Sorry ladies and thank you for the support.