This is a very dangerous statement for him to make. He is letting you know that he’s going to be violent again and that he’s already got his excuse ready i.e. That it’s your fault. I know this because mine did the same. At the time I thought it was just a veiled threat at worst but no, that is how their warped minds work and I think he is going to explode very soon. He has already shown you what he is capable of, believe him. Time to get out for good before he leave your children without a mother.