I have no idea what to do. I think I need to tell my friend but idk.

So, I was with my bsf and some friends the other night. We were drinking pretty heavily but not too much. One my my friends boyfriend and some of his friends show up, we all start drinking together. Eventually his girlfriend leaves but him and his friends don’t. Eventually he drives me and my best friend home but I passed out in the car. Next thing I know I woke up with only him in his basement and he’s handing me the bottle, without even thinking I drink it. Next thing Ik he’s doing it to me. This triggers me sm I can’t move and I fall back asleep in a few seconds. The next morning I wake up with just him in his basement, and he asks me if I remembered anything from last night, I said not really. He just smiled and drove me home. I know what happened but I don’t know if I should tell my friend. I know she wouldn’t believe me. I’ve seen her not believe a girl because it was one of her friends, I have no idea what she’d do if a girl was telling her her boyfriend was doing that. I have no clue what to do the only person who knows is my best friend.