Mad at my brother for telling my friends I got slapped

I got slapped by this girl a few months ago cus we were arguing and I called her a broke bitch. I didn’t do anything back at the time. I’m 25 and the girl is 19.

My brother wasn’t there but he found out about it but I told him never to bring it up. He agreed.

I still live with my mom and brother so yesterday I had my friends over yesterday and me and my brother started arguing about something and I called him a bitch and he was like “I know you not calling anyone a bitch when ____ slapped you up and you did nothing”

My friends started asking questions and I’m so fucking mad at my brother for betraying my trust like that.