Frustrated!!!!!!!!

I am so damn pissed off with my brother. I specifically told him DO NOT TELL MUM and the next thing I knew, my mum knew about it already. I feel like smashing his damn bloody head for being stupid and box his damn bloody mouth for not being able to keep a secret. Which part of "DO NOT TELL MUM" can't he understand? Isn't the instructions clear enough? When I asked him why the hell did he do that, he simply said he forgot. And then he acted as if nothing happened. Like, WHAT THE FUCK??????!!!!!! Until now I'm still having a hard time accepting the fact, and not ready to tell anyone, and yet there he is, going around telling people. Why is it so difficult for people to understand other people's loss? What the FUCK was he thinking???? Such an ASSHOLE!!!!!!!!!