Can he do this?

I am finally putting my foot down and asking for divorce from my husband. We have 3 kids, together 11 years (married 9). He is verbally, mentally, and emotionally abusive and has even been physical a few times (all of which were "my fault" according to him). When i told him i wanted the divorce, not only did he immediately start telling me off but he said that he would make it extremely hard for me the entire process and he started saying how he was going to revoke his rights to our children specifically so he doesn't have to pay child support (he is about to be in residency for medical school) and that he would also file for himself to receive spousal support FROM ME. He currently makes no money aside from loans but will start residency in July of 2025. I make about 73k a year and would have full custody of 3 children. Would this even be possible? I know he's trying to scare me into not leaving to continue doing everything for him. But I cannot in my heart move to a new state away from my family with the way he treats me and our kids. I am already alienated as it is and have lost myself completely. I have to leave him before he moves to a new state where ever his residency will be for Emergency Medicine.