You seem to be between scylla and charybdis.
If you had not said he would not change, I would have suggested some counselling
sessions with a counsellor or even a family well wisher, who both of you trust and respect.
I would suggest the same even now.
I think you should try finding out, with help or by yourself, why he does not want children etc and try and see if you can address some of his concerns.
If even that does not work, then you may have to decide between going for a child and taking all the responsibility with the full understanding and some hope that he may change (some do) or deciding if you would be happy to go by what your partner wishes.
whatever decision "you" make, it has to be one which will keep you happy as well, as a sad person can not keep others happy for long.
Best of luck