OP, I just wanted to send you some
Personally if it where me, I would leave for a while.
Not so much to make him realize what he has lost but to give him time to think, and same goes for you too.
Whatever he is going through having a child is never just "your fault" or "he had no decision" he took place in making your children just as much as what you did. I think he needs to realize that and take responsibility.
Has he always been this type of person or has it gotten worse after you youngest was born?
It could be PND, it might not.
Have you considered marriage counseling? Or even just individual counseling? That might help you understand (and him to) why he feels this way and why he feels the need to say hurtful things like that
Thinking of you.