Why can’t men just take responsibility

So long story short I found out I was pregnant in the beginning of September and told my two kids dad (it was a non planed pregnancy) his only words at that time were abort.

Fast forward to the end of September when morning sickness hits and he messages me while I’m dropping the kids at daycare “you’re taking care of that thing this weekend I’m not having another child” I then advocated for myself and said it’s my body and my choice this is my child and I’m not going to have an invasive surgery just because you want me to.

He didn’t speak to me for days but just recently on October 10th I had my first ultrasound. Turns out I’m not having baby number 3 I’m having babies number 3+4 I personally am really excited but when I told him he just told me he didn’t wanna see the ultrasound he didn’t want the child and he told me “don’t be stupid” …. How’s taking responsibility for my actions stupid I already have two children have been through two deviating miscarriages? When should I sweep my children under a rug like they don’t exist just because you don’t want to take responsibility for your actions?

I gave him an ultimatum he can either grow up or get out at this point.

(Pics of my twins as I’m excited af they could not confirm if they are di/di or mono/di twins from my ultrasound ) my doctor also doesn’t actually tell me I’m pregnant with two until Wednesday the 18th!