I dont know what to do

My boyfriend and i broke up and im still in my first trimester. I am already a single mom to twin boys and my ex is a single father to 4.i always told him i admired him for stepping up and being there for his kids after his babymomma up and abandoned them. My sons father walked out of their life when they were babies. As far as me and my ex unborn baby goes, he said that its "something I'll have to figure out" and cut me off. He is abandoning our child so very ironically given our life situations. I'm pretty pissed but ive decided to have the baby and take him for all the child support i can get and i can bet money he will not try to establish rights in order to evade. I cannot wait to take him down for what he has done.