First of all - I know, this subreddit seems to be more about getting girls, rather than getting rid of them - but still, I feel this is the right place to post this since I need a place to tell what has happened to me and to share a few thoughts.

The story begins in early April, 2017. I’m a university student and have newly moved into a shared flat together with 5 other people. Within the first days I got to know all of my flatmates and when I got to know this one particular girl, I immediately knew she was into me (I - back then - even messaged a friend of mine that I was sure of that). I also saw her boyfriend together with her on one of the first days after we all moved in, he is a small and skinny guy. So, we all started living together and this girl started asking me a few times to watch some TV series together, after some days or weeks, I agreed. We then watched some old X-Files episodes and at one point started kissing. When I wanted to take things further, she denied and said that she can’t do that since she had a boyfriend. I wasn’t interested in more than a casual hookup anyway and turned around and tried to sleep.

The next day she went home to her parents where her boyfriend also lives and that evening I received a call from her. She told me that she got a guilty conscience and started telling her boyfriend what has happened. As soon as she realized, he didn’t react well to that (No shit, Sherlock) she started telling him the story in another way.. She said, I just started kissing her against her will. And she also told me on the phone how much she is unsure about whether she still wants that relationship and stuff like that.

The next months and weeks, she more and more seemed to seek my attention. Sending me messages and pictures on Snapchat all day, trying to get me to watch some shows with her. And pretty much “stalking” me. For example, she was always in the kitchen when I was there. She then also started telling me about her sex dreams in which I starred. And she tried entering my room at 2 o'clock at night to sleep over because she had "bad dreams" or something, thank god I had my door locked.

I never made a move again, since I got turned off by her behavior and probably it’s not a good idea to hook up with a flatmate anyway. But she never stopped sending “signals of interest”, sometimes it was not only a signal but very clear. It seems like the less I was interested, the more she was.

Some weeks later, she was on vacation with her boyfriend and told me how everything in their relationship is alright again and that she can’t even relate to situation when we kissed and that she would not do something like this again. I genuinely felt relieved.. but little did I know.

Then, about a month ago, it was her birthday. And she decided to celebrate it in our flat. There were like 20 people sitting and drinking in our flat, including me - and her boyfriend. That evening turned out to become rather awkward as soon as most guests were already gone and it was just her, her boyfriend, me and two other people left. But he did not say anything , he might have been a bit scared to do so anyway, since I’m more than a whole head length larger and go to the gym regularly for years.

Then, yesterday evening she apparently started her master plan. I agreed to go to a party with her and 5 other friends (all of them female). We went to rather empty club and suddey, at one point all of her friends left. That was the moment, I realized that something is wrong. Few moments later, she started kissing me and drunk as I was, I started kissing back which was a huge mistake. About ten minutes later we went home where she immediately started pulling me into her room. I didn’t want to sleep with her any more since I tried the first time and I told her. That’s why I went with her into her room in the first place, since I did not want to explain this in the hallway where we could be heard. Apart from not being attracted, I felt sorry for her boyfriend, did not want to ruin her relationship and I also don't want things to get strange between us since we live in a shared flat. Also I'm a very bad choice since I'm not looking for a relationship. That's exactly what I told her but she would just embrace me and hold on me like a monkey, refusing let me go.. and meanwhile she started to undress the both of us, ignoring that I told her to stop. Me, being an averagely tall and built guy.. could easily just stand up walk with her holding on me like that, and I did. But she would just say “Fine, go into your room, then we gonna do it over  there”. I then gently tried to push her off me. It had no effect, so I tried a little harder but of course I did not want to hurt her. So I tried again talking to her to let me go, but she refused, begged me to fuck her, saying things like I'm the hottest guy she ever met and then started saying threatening things like “You went home with me and I got bruises on my skin now, how is this gonna look?” All in all it took me about an hour to get her off me and let me go. Meanwhile I had Iearned that she had planned all of this for almost half a year, all of her friends and even a flatmate and a former flatmate knew about this.. then I got bitten in the face, right on the cheek and she pushed her finger nail into my hand until it started bleeding. Not that I care very much, but it’s nothing I would ever do to anyone.

All of this is such a surreal experience to me. I mean, a crazy girl so obsessed with me and not letting me go unless I sleep with her. And me being helpless and unable to do anything, since I cannot be violent. I'm asking myself now how I should have reacted correctly, apart from not even going into her room.

Some of my thoughts:

Imagine it being the other way round, a guy doing this to a girl. Lots of girls would probably call the police because of attempted rape (and they would do it with good reason).

Imagine me being a guy with a skinny posture, such as her boyfriend’s. I, for sure, would not have been able to move.

Also, I realized how easy it is for a girl to say “you were violent towards me”, even though I just wanted to get her off me.

Edit:

TL;DR: Got a new flatmate, tried to bang her, she refused cause of bf, she got really into me, planned a whole evening together with friends to get me into her bed, I didn't want to fuck, she jumped on me like a monkey, took me an hour to get her off me, got bitten in the face and stabbed into the hand with her fingernail