Terrifying encounter at a wedding

I went to a wedding of my friend Courtney about 2 days ago and I still can't shake my mind over what happened. For context I grew up in a very religious household and went to a church every Sunday and Courtney is probably the only person from my old church that I still keep in contact with. The situation started at the reception. Courtney was super excited to see me and was definitely the only person who felt that way judging from all the stares from the people at my old church. I sat down at my table and started playing something on my phone when some guy sat next to me. He said that the seating chart said that he was supposed to sit at my table and introduced himself as the groom's friend Anthony. He was pretty cute so I spent a lot of time talking to him and we really hit it off. He didn't seem to judge me for being an atheist and seemed genuinely interested in me.

When the dance started they started playing Brown Eyed Girl and he offered to dance with me. We danced together for most of the night until he left to go to the bathroom and a little later I did too. When I came out I saw that my purse wasn't on the table which was weird because I swore I left it on there. I was tired and thought I had just left it in my car so I went in the parking lot and into my car to look for it and found it on the center console. I still thought it was weird because I really thought I had brought it inside but at that point it was pretty late in the night so I didn't think much of it. I danced some more and noticed Anthony was gone. I asked the groom who said he had gone home because he wasn't feeling too good.

Pretty soon I felt pretty sick too so I said bye to Courtney and went to my car. As I put my keys in ignition I looked behind me and saw something weird. It looked like something had ducked down from the trunk. I took my keys out and looked back there and that was when I saw him. Anthony was crouched down in the trunk of my car. I started screaming and ran out with him chasing after me. I went inside and told Courtney who immediately told her husband who walked me back to my car where Anthony was nowhere to be seen. Courtney's husband said that he didn't see his car anywhere so he probably left. I left and I still feel sick to my stomach thinking about it. He could've easily gone home with me and killed me if I hadn't looked back. Courtney said that she feels terrible that she invited him and that she had no idea he would do that. I haven't stepped out of my house since because I'm worried that if I do he'll be waiting for me like he was before.

UPDATE : The last couple days have been kind of crazy so I haven't had the chance to look but thank you all for your advice that I wish I'd have known about earlier. Unfortanutley my address was on my ID and as I learned now Anthony took photos of it. Anthony and the groom aren't exactly friends but they know each other well enough for him to be invited. After the whole fiasco the groom tried to text Anthony about it but got no response. Anthony showed up at my job and lurking around the parking lot before he ran off when he saw security. He left me a note on my windshield that just says "I'm watching". Security at my job has been notified about him so hopefully I'm safe there. I was told by other people that went to the wedding that he was introducing himself as my boyfriend and that he was planning on proposing. I'm currently trying to file a restraining order against him and feel horrified. He lives in my city and knows where I live so I'm staying at my aunt's house as I speak. If anything happens I will update again.