When my H made crazy threats like your H, my therapist asked, "What does it hurt you? He took on this debt alone and any further debt he takes on alone. So his actions have nothing to do with you."
He's trying to bully your rational side into his crazy reality. Please read, Patricia Evan's "Controlling People" until the end. In short, he is abusive and you need to say, things like "What?" when he tries to drag you to his crazy reality. He can't explain questions like "What" because they makes no sense to you and he has no sense.
