My brother

So when I was younger, my brother used to touch me. Like, inappropriately. This went on for about 2 years, but stopped when my mum found out he was doing it to my sister. I don’t want people to comment saying that he is a awful person because I love him, but he’s really fucked me up. No one is allowed to touch me, and that makes intimacy really hard. I don’t know if I should tell my mum, I feel like it’s my fault, and I don’t want to ruin his life. Please help!!!