The guy I ghosted appears at my workplace

(I know this story is a little long...the whole thing is really creepy, so please bare with me): <br><br>As a background to the story: I work as an educator at a university in the field of social work. In Germany we have so-called "studentische Hilfskräfte", which are students that work part-time for the university. One of the tasks of the studentische Hilfskräfte is to lead tutorials for first-semester students. Tutorials are classes during which students work on tasks and the studentische Hilfskräfte lead them and help them with the tasks. <br><br>I used to lead tutorials for first-semester students. I really enjoyed that job and the students liked me a lot and I became very close to them. One student in particular was very close to me, let's call him P. Even after the tutorials were over, P kept in touch with me. I thought it was really sweet and I also enjoyed having him around. I never felt unsafe or anything around him. He was always very respectful and friendly. <br><br>One day, P and I got extremely drunk together. I really don't know if he planned that or if it was an accident but somehow we got really drunk and had sex. The next morning I really didn't like the idea of P and I being a couple. I didn't really like him in a romantic way. Also, I work in a position of authority at the university and it doesn't look good if you are in a relationship with a student. I decided to ghost him and not answer his calls. I felt terrible about it but I also thought he would leave me alone and find another woman. <br><br>The next week I was surprised that P showed up in the class in which I lead the tutorials. He hadn't been there for a long time. When I saw him, I got very nervous and couldn't concentrate. P looked at me the whole time and at the end of the class he came to me and said "You are cheating on me, aren't you?". I was really shocked and asked what he wanted. Then he said "I know you are cheating on me. I know it. You have only been mine since the first time we met. Look, I painted something for you." He pulls out a painting, in which he painted himself and me. "It is us two. I am the man and you are the woman. This is who we were destined to be". I was extremely shocked and asked if he was insane. Then he said "Are you in a relationship with a colleague?". I was shocked again because he seemed to know exactly who everyone was. "Do you know Dr. X?", he asked again. Dr. X is my mentor. I said yes. He said "He is very jealous of me, isn't he?". I said no, he didn't and he asked "Then why are you smiling at him?". I said "I don't smile at him. I am just being friendly". Then he said "You are smiling at him because you are in a relationship with him. You are a bad girl. But I will forgive you if you come back to me". I was so scared and said that he needs to leave me alone. He said "No, never. You are mine. Do you know where I was today? I was at the main building and saw your department leader. I told him we are a couple and he said he didn't know. You lied to him, didn't you?". I was so scared because my department leader knows P is a former student of mine and I was afraid my department leader would think I was in a relationship with him. I said "I only said that because I am afraid of you. But you don't scare me. I am not afraid of you. Come on, you think I am your girl? You think we are a couple? You are delusional." Then he said "I will show you what will happen to your beau if you don't come back to me immediatly". I asked what he wanted to say. He said he would hurt him. I said "If you hurt him, I will call the police and I will never go back to you. I hate you". He said "We will see about that". During the whole conversation nobody else was in the room. He left the room and left me all alone crying. <br><br>My heart was racing so much I could hardly breathe. I felt so scared I could barely work anymore. I didn't walk alone on campus anymore, but always asked my colleagues to walk with me. I even didn't go to the bathroom alone anymore. I kept looking over my shoulder to see if P was behind me. Sometimes I saw him on campus, walking around. I walked faster when I saw him but I didn't tell anyone about it. I felt like I was going crazy. One day I got a call from my department leader asking me if I can come to his office. I went there and he told me P was there and told him that P and I were in a relationship. My department leader told P that I had told him the truth all along: that P was her former student and I had nothing to do with him. P keeps asking my department leader if I told him the truth or if I lied. My department leader was so confused about it and asked me if I knew what P was talking about. I said I didn't know. Then he showed me a.selfie P and I had taken together. I started crying and said "where did you get that?". My department leader said P had given it to him. I asked "How did he get that selfie? I deleted that selfie a long time ago". My department leader said he didn't know. I got up and got really nervous. My department leader asked if I was okay. I said no, and then I left for home. <br><br>I was traumatised by the whole situation. I had anxiety and couldn't sleep. I kept looking over my shoulder to see if P was behind me. I kept walking faster when I saw him. I told my mum I wasn't feeling okay but I didn't tell her what happened. She was worried about me and asked if I could see a therapist. I said yes. I called a therapist and she said I needed to talk to the police. I said I was scared to do this. The therapist said I needed to tell my department leader about the incident. I said I was scared to do this. The therapist said I needed to do this. Then I went to my department leader and told him what happened. He said we needed to tell the police. I said I was too scared to do that. My department leader said he would report it for me. The police said they couldn't do anything because P is untouchable. There was another incident where P threatened someone. The person went to the police and the police didn't do anything. The police said the only way they could do anything is if P does something illegal again. My department leader said he would talk to the vice president of the university to make sure that P is not allowed on campus. I said that wouldn't help because P is really smart and if he wants to get on campus he will find a way. My department leader said I needed to take care of myself now and that I shouldn't worry about anything else. Then he left the room. I kept looking over my shoulder and kept expecting P to be there. I really hated having this feeling. I hated being on campus and feeling so scared all the time. I don't know why P suddenly disappeared. I guess he has found another person to obsess over. I do hope he didn't hurt the other person. I still work at the university and I feel safe because I know my department leader has my back. I hope P never comes back.