Just found out my husband has a 12 y/o

Been together for 7 years, married for 2, and he’s never ever ever told me he has a child, we’ve discussed starting a family and were planning it next year. He got a letter from court with a date regarding child support payments, saying this is now the final notice and you need to attend or we will arrest your earnings, I found it in his work bag when I was emptying it for laundry, questioned him instantly and he admitted his ex girlfriend fell pregnant and told him she didn’t care if he was involved but to pay child support and he refused to be a father and pay any support and blocked her everywhere and never spoke to her again, she apparently reached out when his son was born, 2, 6, 8, 9, 10, 11 and now 12 and is now taking him to court for payments. I’m super disgusted and disappointed in him tbh, he cut this women off instantly after impregnating her, didn’t pay a penny or support his child in any way for TWELVE years? I told him he needs to start paying that now and he said we need it for OUR baby, and I replied that I don’t know if I want an our baby anymore. He hid a whole child from me for the entire relationship, lied about it, and abandoned this woman emotionally physically and financially, she’s the mother of his child and I don’t want to be the second baby mama to be abandoned. I’m honestly furious. I don’t even know who he is right now. I’ve told him he needs to start by making this right with her and sorting finances out because it’s unreal