How would you feel

Tbh think about that you took the right decision as not being with him anymore. This to me would be the signal that i needed to keep my life by myself and kids and do not come back.

Are you in a relationship with him? Or were you when you got pregnant? Feel like the context matters on this one

I'd be absolutely furious and would leave and not come back...I don't let cheaters stay with me

Now you have a right to be upset by him having another baby with someone else especially if you guys are together so that would mean that he cheated and now you and the other girl are pregnant at the same time. If yall wasn't together then you will have to get over it and just focus on your babies. Do you have family support? If so then you have to make a decision on whether you want the relationship or just co parent with him and be single. I would look up in your state how child support goes if the guy has multiple children and the percentage you will get for your children. I hope things work out in your favor.

Are yall together? Or were you together the entire time after you had your 2 y/o to getting pregnant again? I def wouldn’t feel good, but I would not longer be with him. I’d try to build a relationship with the woman who is pregnant so my kids can know their half sibling.

Maybe I would cut contact with him and move on with my life without him.
Better to be alone with your baby and pregnancy than drama.

It’s not like you accidentally get pregnant. I’m sure this dude has shown all the red flags. Stop giving these losers kids.