I've seen people say this before: "If he really loved me, he'd change his mind and let me have another child", which is pretty much what you're saying with "He can't really care about me if he's prepared to stop me following my dreams".
Sorry, but it doesn't work like that.
You're basically saying if he doesn't give in to your desire for another child, he can't really care for you. By the same token, he could say you don't really care for him because you won't give in to his desire for no more children.
He wants one. You want two. Your "dreams" are in EQUAL importance to his "dreams". His desire for one child is as EQUAL in importance to your desire. It's not a competition.
It's a sad situation. If neither of you feel they can change their mind - because you can't compromise on this - you have a choice. Accept it, build a fabulous life for your family of three. But if you do that, perhaps have some counselling because if you stay it will not be fair to resent him. Or, reject it, leave your husband, split up your family and see if you can find another man in the next few years to give you another child. But do think how your current child will feel in terms of being passed from parent to parent every few days and when they are older, that your desire for another child doesn't make them feel they weren't enough for you and that you preferred to break up the family (and I've known that).
Good luck.