OP, please remember that he is a debt ridden loser that clamped onto a very vulnerable woman with a house.
It's classic behaviour.
He controlled you seeing your family in your house. He banned them until it suited him.
This is so abusive and controlling.
He hates your cats and is horrible to them.
He lives off you.
Of course he is going to backtrack and say he wants to make it work.
A free home, free food, utilities.
Of course he wants to make it work.
OP I have a bunch of fabulous single friends.
Not one wanted children and not one of them would entertain a man with them.
They have met childless men and have great relationships.
They have kept their homes separate too.
They are in their 50's and every one of them looks amazing.
All living their best lives.
If you don't want children, think long an hard about going near a man with them.
It is 100% normal to not want children and not want to rear anyone else's.
You deserve the best.
He isn't it.