You were and are protecting yourself. You don’t owe them anything more than what you’re giving them right now. From my personal standpoint, if they ever bring up how you are hurting them, recount what they did to you. Tell them they hurt and damaged you. I don’t know if this will help you or not. But I don’t believe you’re numb. You’re taking care of yourself. As you said, someone had to care. Good luck! I’ll be thinking of you.