I'm so sorry OP. I have had a similar set up but in mine he waited until the baby was one and THEN decided it wasn't what he wanted.
I love my youngest but there's a massive age gap between him and my others, and I was talked into it on the premise I had a very willing, hands on parent on board and willing to share it all with me. He totally screwed me over. 😡
I was so poorly early on in the pregnancy too and he encouraged me to keep going.
Having a big age gap between kids my body didn't bounce back like it did when I was younger. Neither did my weight, and gravity was crueller. I'm fucking wrecked. So tired. Had a mental breakdown. Pelvic floor is fucked. The sleepless nights hit harder physically too.
I've zero chance of meeting anyone as I've no support network and my youngest is hard work.
I love him a lot but I also struggle hugely with resentment and at times I've had to battle for it not to show in my parenting. 😔 If I'd had a crystal ball or a time machine I'd not have gone ahead.
I have had an abortion in my teens, then kids in my 20s, and then youngest in my 40s. I don't regret my abortion I had years ago. Sometimes we have to look at things with cold reality. Not just for ourselves but also for the potential child who would be in the world and what sort of world they'd have.
I'm so sorry you have such a tough choice either way.