Hi op, I’m in your husbands position (my husband desperately wants a second child, but I don’t. Our son is a teen and I am enjoying having a life again).
When my husband starts to want to talk about another child, I can see how emotional he’s getting and I know he feels upset. I feel equally annoyed with him, for piling on the pressure. So both you and your husband are possibly feeling the same way and it’s not healthy.
As unfair as it feels, to bring a child into the world when one parent has explicitly said they don’t want them, is not a good start to any little person’s life.
So how do you get past this? Acceptance. Come to terms now, with the fact it’s not going to happen. Don’t bring it up again. Don’t think about it and enjoy the two you have. If the youngest asks for a baby sibling, tell her that mummy and daddy love her so much, they don’t need anymore babies. Nip it in the bud. That’s what I did with my son and he’s fine, hasn’t hurt him at all.
I understand it’s disappointing, but the alternative is dropping a grenade into your family, so time to let it go.