Partner told me he won’t come to our child’s birth

My partner isn’t very happy about me being pregnant and has insisted that I have an abortion as it’s not fair on my 1year old boy I have decided that I’m not willing to have an abortion and that if he didn’t want to be involved then that’s his choice but he is staying I’m guessing because he doesnt want to leave the child we have. But today he has expressed that he will not come to the birth of our child because he won’t leave the child we already have to be there. I’m not sure how to feel or how to react I’m really upset and feel like I’m on my own with this . Has anyone else had the same or any advice please ( I love the bond my partner has with the child we already have and that is mainly what is stopping me from just saying ya know what you clearly aren’t there for me so leave. ) its so hard 😭😭