My best friend tried to rape me

Last night my best friend forced himself upon me, and held me down and kept kissing me, and soon tried getting me to give him oral sex and for him to have sex with me. I got out of it luckily by getting out of the car and running when I could, but I dont know what to do. He was one of my best friends, and he ended the night by telling me to “dont fucking tell anyone”, im scared of what he might do. Im friends with a police officer, and maybe he could help, but I dont know. If anyone could help, please comment something, its all I think about