He broke my trust again even after breaking up

I want to scream and cry but with the situation I am in, I can’t do that. My ex told my little sister what happened between us. That was my one boundary that I didn’t want my family to know what actually happened. I’m so hurt right now. I thought ending the relationship would prevent him from hurting me. But even while in no contact, he still is. I hate this. I feel like it’s night he confessed to me all over again. I just want my boundaries to be respected. I don’t know what to do anymore, I’m so so hurt. I’m broken. My boundaries and trust feel so meaningless.