The most terrifying thing that has ever happened to me

I (f26) live in a small town in the Midwest. I'm a nurse and work the night shift. I had just gotten off work at 7:30am one morning when a man I had never seen before walked up to me from across the parking lot. He approached me and asked if I smoked. I said I didn't and he said he was trying to quit. I said I couldn't help him, turned away and started to walk to my car. He asked if I was in a hurry, I said yes, and he kept talking to me until I stopped and said "look if you're looking for a hookup or something just say so and I'll go." He said no, no, he was just trying to quit smoking and asked if I could help him. I'm not sure why I said this, but I said that I smoked and he said he could give me some and we could go for a walk. I said no thanks, just try cold turkey, and he asked if he could try to convince me. I said sure, and we sat on a bench in the parking lot. I was completely aware of the situation and how fucked up it was, but I just couldn't move. I was so fucking terrified and knew that I had to get away before something worse happened, so I just stood up and started to walk again. He was bigger than me, and I could feel him towering over me. I tried not to show it, but inside I was panicking. He started to follow me, telling me about how smoking was the best way to quit, and I stopped at my car and dug in my purse for my mace. I pulled it out, held it at my side and tried to open my door. My keys weren't working, so I jerked my mace out and held it on him while I tried my keys again. I got my door open and told him to get away from me, which, of course, just made him laugh and say I was playing hard to get. I got into my car and locked the door and told him to go fuck himself. He started to walk away, but then came back to my window and said that it was nice running into me, and I couldn't help but but but feel a little turned on that you want me but can't have me. I just sat there in silence as he walked away. I never took my eyes off of him and was so fucking scared that I was gonna shit myself. I don't know how he knew I was scared of him, but he knew exactly what he was doing the whole time. I'm not sure if he would have raped me, or tried to hurt me, or what, but I'll never forget how fucking terrified I was that morning. I don't ever think about it, and I've never told a single person about it. It's just something that happened, but it's never crossed my mind. Until now, that is.