I dont think you are overreacting at all. Id be incredibly hurt if someone who was family let my abuser live with them. There is no right or wrong? Thats more crazy than any of us, threatening to kill someone IS wrong. Telling someone they arnt loveable is wrong too.

It sounds like a really bad situation to be in. Hopefully he isnt coming back? It sounds like good self care that you got the order of protection. Wonder what your brothers motive is to help him, that seems awful. So sorry this is all happening to you.