I can't even have a nice day

I've worked a lot the past few weeks and today I wanted to have a nice day in the city for myself. I went to the park and this guy walked a bit with me. We chatted. Nothing bad. I didn't think much of it until he asked if I was single. I told him I'm not. He said he was. OK cool dude whatever I don't care. He then asks me why I'm alone if I have a great boyfriend. I started to feel uncomfortable and told him I just don't mind being alone and that we can't constantly be together. He basically said that such a pretty and young woman can't be walking around alone and be single. I lied and told him my guy and I are about to get married but you wouldn't take a no for an answer because of course not. He already stood super close to me and then proceeded to take my hand without consent. I immediately pulled back. He wouldn't leave me alone and there was no one else in that part of the park. I got so scared. He tried to force me to give him my phone number saying he so badly wants to hang out with me. I said no but he wouldn't take it for an answer. Despite being extremely triggered I still managed to walk away somehow. I immediately started crying and just wanted to throw up. I'm still not feeling OK. I'm dissociating very badly. I just wanted to have a nice day. I feel like I can't go anywhere alone anymore without someone hitting on me and touching me without consent. Im so scared.