What do I do?

There is this guy that I’ve been dating. Well we went out one night in his car with a few of his friends. He saw a dog in the rode and said that when we came back through he was going to run the puppy over and everyone was laughing in the car and I looked at him and was like no you’re not. After we came from a party we drove back and the puppy was still in the rode he told me he wasn’t going to hit the dog but he was going 50 and ran the dog over and it started whining and I cried. I was mad and wanted to leave. They were mocking the puppy in pain. I didn’t talk to him and he wouldn’t take me home. I laid in his bed texting all of my friends to come pick me up, he grabbed my phone and looked at me and said tell your sister you love her because it is the last time you will tell her. I got scared because I take care of my sister and I didn’t want her to go to a home. He drove me back and said that I wasn’t going anywhere and the drive back he told me about how he has killed multiple other animals but while he was telling me he was doing 100mph in a 30 around a curve we almost flipped and he continued. He told me that if I didn’t give him gas money he was going to hit the car in front of us going 80. At this moment I’ve distanced myself from him but I’m scared that my life is in danger. He’s a horrible person and it just scares me. As of right now he tries to get in contact with my sister. Tried to hold conversations at the beginning he would call my sister while I was sleeping next to him and my sister would answer thinking it was me. But it wasn’t it was him. Ladies what do I do I’m scared.