My brother beat his girlfriend right in front of me, then kicked my ass for stepping in, what should I do?

Anonymous
Last night my brother was mad at his girlfriend and ended up hitting her repeatedly, he blacked both of her eyes, he cornered her in the front seat of her car and punched her several times. I stepped in and stopped him and I broke his nose and he beat the sh*t outta me. The cops were there and they both lied about what happened, I wanted to tell them he beat her, I feel like I need to get her away from him, but it's my brother, I love him. I don't want him to go to prison, He's playing it off like nothing happened, and thinks it's not that big of a deal. I don't think I'd be able to forgive myself for not doing anything if he did it again. I really need help, I have no clue what I should do. can someone help?
My brother beat his girlfriend right in front of me, then kicked my ass for stepping in, what should I do?
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