How do I get rid of my psychopathic girlfriend? (long story...)

Firstly, and most importantly, if anyone feels that they know who I am, or who my girlfriend is, can they please not contact me or her, and please not indicate in any way who we are. As you will come to read from the situation she would kill me if she found that I had posted here. I genuinely mean that when I say she might kill me.

The situation:

I have been with my girlfriend for about 12 months since meeting her towards the end of my first year at university. The first few months were great last summer, as they so often are with new relationships.

After that time though, everything changed. She has slowly but surely become incredibly possessive and psychopathic. I genuinely mean that. She took every female off of my phone, except for my mum. She blocked every female off of my Facebook friends list. She then did the following, and gave me the following conditions:

1) She reads every detail of my phone at the end of every day, who I've called, who I've messaged, and what has been said.
2) She made me give her every username and password for every contact possibility I have on the internet so that she can check up on me at will (but she doesn't know about TSR).
3) I am not allowed to log onto Facebook without her being there.
4) I am not allowed to check my email without her being there.
5) I am not allowed to spend a single night sleeping without her. On the rare occasions I am "allowed" to go out with my friends, I have to go back to bed with her at the end of the night.

She has very quickly destroyed all my friend relationships with every female on this earth, and also slowly but surely is destroying all my friend relationships with every male on this earth.

She is very very moody and violent. She often starts arguments when she gets home from university, and she often makes sure that these go on throughout the night until the early hours. She scratches me, and I now have several permanent scars all over my body. She bites me as hard as she physically can, and I am covered in marks. She almost cleanly pulled my ear off a couple of months ago, and made me say that it was a rugby incident at the hospital when I was having stitches. She gives me love bites whilst I am asleep, waking me up in agony in the process, to "make sure other girls know I am with someone".

I have never hit anyone in my life, and all I can do is attempt to defend myself by holding her back, but I always still end up bruised and bloody. If she doesn't get me whilst I am awake she will wait until I am asleep. On more than one occasion I have been woken up with a punch in my face. She is violent towards me in these ways probably two or three times a week.

Stemming from her possessiveness, she effectively moved herself into my house, even though she still has her own place. She refuses to leave me alone for one night, and gets angry if I suggest I need time on my own. She accuses me of wanting that time to get "other women" into my bed. The accusations are endless. She gets into moods most days which almost always end in her becoming violent, and this can stem from something as trivial as me "looking" at a woman on the bus.

She has now rail-roaded me into proposing to her, and she now proudly wears an engagement ring. She got me to agree to this with the help of a kitchen knife. It was hardly a romantic proposal. She says that we now have to be married before the end of the year, and I really do not want this.

I have attempted to break off the relationship several times but this only makes her more violent and makes her resolve stronger. I can not get her out of my house, where I live with three other students. Most of her stuff is here, and she has a set of keys to the place. On the occasions I have tried to break up with her she angrily and violently says "nobody breaks up with me!!!" and that she is going to "dedicate her life to making mine a misery". Sometimes she gets so angry that she picks up very sharp kitchen knives and starts slicing at her arms and legs and threatening to kill herself because of "the pain I put her through", but I really do not ever do anything wrong. She is covered in self-inflicted knife scars now, and they are apparently "all my fault".

I do not know what to do. I need help. If I call the police on her again she could well be deported back to the country she came from. She is an international student who came here to study. I get the feeling that if I run away she will always find me. I genuinely feel that she will kill me if I attempt to break up with her again. Can anyone advise me on what to do?

I replied to the other thread, but I'm going to say it again because it's so important:

Get proof before you call the police. Get photographic evidence. Write down what happens. Keep a dated diary of incidents. Go to the hospital and get the records about your ear.

Then act.

I replied to the other thread, but I'm going to say it again because it's so important:

Get proof before you call the police. Get photographic evidence. Write down what happens. Keep a dated diary of incidents. Go to the hospital and get the records about your ear.

Then act.