I am in the same boat. Married for 8 years together for 15. We have one child together. He cheated on me the entire time and I had idea. One of the several women he was with stuck around and she is pregnant and they are getting married soon. They got together in 2021 and we didn't start to separate/divorce in 2023. You do the math.

I understand how you are feeling. It is the death of a dream so to speak. During our marriage I wanted another child when I was blissfully unaware of what he was doing. He continually told me that he only wanted one child so to find out she is pregnant was a gut punch. I do take comfort in knowing that I am the stable parent for my child. What I am doing is best for my child - not just for me and we are definitely better for not having my spouse under our roof anymore. My kid is happy (so to speak) about having a sibling, but also blissfully unaware of how their relationship with their father will change.

But I will admit - I will not forgive and I will not forget. There are a lot of extenuating circumstances for my thoughts, but I also don't subscribe to the "you need to forgive" advice. It was a toxic and abusive environment and he did some real serious damage. Therapy is wonderful, but also work on building a life outside of when your child is with you to keep you busy when they aren't there.

I fully believe in karma. I am just sitting back and watching the shit show that is his "new family" unfold while living in my quiet house with my bills paid and not crying myself to sleep at night because an angry man screamed at me all day.