My abusive ex wants revenge! Help!

We were together for almost 2 years. He was very abusive to me and disrespectful. He would call me names and insult me left and right. My friends opened my eyes to how badly he treated me. I broke up with him a few weeks ago in the car. He was respectful at first but during the car ride his anger grew. He said “Im sure you will replace me real fast. I am easily replaceable”. Then he started blabbing about how he wished he could beat up my friend but cant because she is a girl. He hates her. Then he started blabbing about how he wants to beat up her bf. (for no reason he has done nothing to him). He would also never fight someone who has a chance of beating him because he is a coward and a pussy so it is all talk. Then when he drove me home he saw her car parked in my yard and he kept saying he was gonna hit it but he didnt thankfully. I did not talk back to him and I was really nice to him when we broke up even though he was acting like a complete douch bag. Now he wants revenge on my friend and possibly on me. Him and his jerk friends like to rap. They make terrible diss tracks of their exes that are vulgur and cruel and they post them online. I heard that he is currently making one about my friend. Back when him and I were dating I made the awful mistake of telling him some of her secrets and personal information because I did not know that he hated her so much and I was in love with him at the time and I thought that he loved me. I did not know what a terrible person he was at the time. I was blinded by love and when he insulted me and treated me like garbage I always thought it was my fault. I am now afraid that when he releases her diss track he will put a bunch of her personal info that I told him in it and she will hate me forever. I do not know what to do. Also he has my nudes which he can use as blackmail whenever it pleases him. I am terrified that he is going to ruin my life and hurt my friend. I have no dirt on him because he would ask for nudes but never give me any nudes of him. I wish that he would just leave me and my friends alone.