What should I do?

Last year I was sexually assaulted. I was at a party and he asked me to help him get something out of his car. He then pushed me in the back seat & tried to rape me. Luckily it wouldn’t go in. ( his private part was to big to fit in mine) He then smashed my head into his chest & made me listen to his heartbeat. I had no idea why. After that he drove me home. When I got home i wasn’t crying mainly bc i was in shock & didn’t want to be bothered. So I went straight to my room and was putting the stuff in my bag back where they go. I found his shirt in my bag, why would he give me his shirt? All of it was confusing and didn’t make sense. Now I know why he did that. 1. Whenever I lay my head down I hear his heartbeat it haunts me. & 2. His shirt is a constant reminder of that day, I’ve tried throwing it away but I just can’t I have no idea why. What do I do I can’t stand hearing his heartbeat constantly it hurts. Whenever I lay down I cry. His shirt is nice I admit but it smells like him, it reeks of disappointment🤮. I just want it to end.