My fiance and I got into this huge fight..?

As you see he is a boy and not a man. He wants to be young and free while you stay home and be the responsible one with the baby. You can't make him grow up. That is why you where mourning him all night. It is better he didn't drive 2 hours home after he partied with his friend. At least he is alive to support you and the baby. Good luck in the future.