An innocent man is being framed for attacking me?

I am in a little bit of a tricky situation. We are a group of friends (5 guys and 3 girls). We had a party on campus and I left the group to go to the toilet one of the guys (from our friend circle) chased me and he attacked me sexually. I don’t want to get into the details of that but he filmed me too. The problem is, I told my friends when I went back but I didn’t say who attacked me cause he threatened me with the video. There is a different group of friends that are kind of not friends with us and we beef often on campus on of the guys from that group was blamed for attacking me. Although he is innocent and it was my friend everyone is accusing him of attacking me however I know who attacked me (my friend) and its not him but I don't know how to clear his name without “my friend” leaking the footage? I feel selfish but if someone leaks my video i would literally end my life
An innocent man is being framed for attacking me?
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