Long Rant ~had to get this out sorry

So my child's father lost a child that he claims wasn't his he never told me this as he was paying child support and getting the little boy from time to time even had me buy the little boy clothes and everything and after he passed I found out I was pregnant he was happy at first then a few weeks later he says they don't do ultrasounds that early and I wasn't pregnant (had my ultrasound at 8 weeks and begged him to come with me to the doctor) so I show him the ultrasound and lo and behold he says he can't have children and tells me a story about how the the little boy wasn't his (the one he was paying child support for 😑) then I tell him DNA is no problem because I never cheated then he says he's not ready for a baby so at this point I'm aggravated stressed out wanting to kill him and then it hits me that I really don't care if he's there or not I've cried that my child won't have a father I didn't really have one I mean he was present but not there if you know what I mean but otherwise I told him since he's not ready then we'll forget about him and he can forget about us because really I've went to every other appointment alone it's nothing to keep doing it even if it hurts a little I just don't know whether it's me overreacting or if he's just being childish (he's 28 and I was 17 almost 18 when we got together)

Note: since we've been together I took care of him buying him medicine while he was sick, gave him money, bought him food and paid for gas to get to work and took care of the little boy buying him clothes and he says he can't with me because I asked him why he's been ignoring me and then says I don't do anything for him