I moved into a new house 2 months ago. I only share it with 1 more person. It is an English student girl that at first seemed lovely and quiet neighbour, but now, after 2 months I think she is crazy!

First of all, she spends so much time on cleaning everything. Bathroom, kitchen...etc. It smells of chemicals everywhere. She also does at least every 2 days. I understand that areas have to be cleaned from time to time, but this is ridiculous. She also carries some bags with her every time she goes to study at the university and she spends at least half an hour filling them every morning with a lot of clothes, which she carries with her all the time, wherever she goes. She also washes all her clothes in the washing machine every 2-3 days. I have no idea how she manages to get all her clothes dirty so fast (and trust me, she has a lot of clothes). However, her real craziness started to expose a few weeks ago when...

I came into the kitchen one time and saw that she had used nearly half of my bottle of dish-washing up liquid in one day. I was surprised and felt annoyed. It is not for the money, I just didn't want her to use so much of my washing-up liquid. So I made her a remark on that. After that, she started acting in a very weird way, apologizing for this at least 20 times. She even sent me messages afterwards, again full of apologies. I told her to calm down and that I am a nice guy and wouldn't kill her because of that, it was just that I requested her to stop using so much washing up liquid. Ever since I told her that, she stopped talking to me and avoided coming across me in the house, in every possible way. I thought this was all about the washing up liquid, but I was so wrong...

2 weeks after that, after I was really upset that we are not talking anymore, I tried to talk to her one morning I came across her in the kitchen. I apologized about the washing up liquid issue, but she started screaming with a knife in her hand, saying "Do not threaten to kill me!!!" This got me really scared and I asked her "When the **** did I threaten to kill you?!", to which she replied that it was that day when I said I wouldn't kill her. Apparently, she thought that I wouldn't kill her...yet. I literally had my jaw dropped, as I meant that I wouldn't bite her or do anything to her just because of such stupid reason (the liquid issue). I never thought about killing anyone, for god's sake! I was very surprised that she had taken my words so...direct.

She confessed that she had some very serious depression issues in her family in the past, including some killing attempts. After she told me this, I felt really stupid for saying this to her, and I told her that if I knew this, I would never use the word "kill" in a sentence towards her. After very hard effort of apologizing and trying to put reason with her, she accepted my apology.

Now we talk again friendly, as this never happened, but I am still confused and remember the way she held that knife, screaming towards me with a mad look on her face. I don't feel secure anymore in this house, but I really like the place and don't want to move out because of her crazyness.

I have to mention that she is not very sociable person and spends most of her time, studying at university (she is doing her masters at the moment). Besides this issue, there is the excessive cleaning issue, and the hiding-from-me-when-in-the-house issue. She also gets paranoid about everything that happens in the house and sends me dozens of text messages a day to me and the landlord, asking whether we have to fix something that is broken in the house, or whether we have to replace something, etc.

I don't know what to think of her. Any idea what her problem might be? I am no good at psychology, but there is definitely something going on in her head... I would be glad if you can spend time reading my story and offer your advice. Thank you and much appreciated.