Worst weekend ever

Although I have so much to be grateful for because I still have my health and everyone in my family is all-right, for extraneous personal reasons, this past weekend has been undoubtedly the worst weekend of 2009 yet. I don't exactly want to get into the details, but let's just say that I feel pretty hurt by something that my now ex-roommate did to me on her way out. I think what is the most frustrating part of this whole equation is that NEVER at any point did she ever verbalize her unhappiness to me, or even once, did she ever mention to me that she had a problem with the way I lived my life. Ever since she moved in, I tried my best to be nice to her, to give her advice for med school, to lend her my books so she wouldn't have to buy any, to listen to her when she asked me 1000 questions about medical school and what it entails. At the end of it all, she proceeded with a low blow to the belt and a very immature approach to wanting to end her lease. I feel pretty hurt that she turned her desire to save money into a very personal attack on me and my character. I'm pretty shaken and almost feel embarrassed to live in my apartment as I used to because I feel as if everything I did was a real problem for her, and I had no idea the entire time that she hated me so much because she never once spoke to me or emailed me or called me to let me know she had such a problem with me. Perhaps I'm naive because I tend to give people the benefit of the doubt when it comes to judging their character, and I assumed that although she was unhappy with medical school, she was still a good person. Little did I realize that she is one of those kind of people who is unhappy with everything, no matter what. She can never be satisfied with her self or her current life condition. She took her depression and self-loathing and spread it to me and my family and now her negativity is leaving a disgusting stink in my apartment that I can't air out for the life of me.
If I could say anything to her now, I would just want to ask her why she never spoke with me first if she had such a problem with me. I would have been very receptive to her words and would have changed my self to accommodate her needs and expectations. I just feel like the mature thing would have been to speak with me and have me change rather than to secretly take pictures of my apartment when I wasn't home and then email a powerpoint presentation to my dad two months later saying that she wants out of the lease now because I am "irresponsible and cannot be lived with." I feel really ashamed for even having an election party at my house and inviting people because had I not had a party, my apartment wouldn't have been such a mess after and it wouldn't have given her reasons to walk around taking pictures behind my back the next morning without even letting me know that she wanted the mess cleaned up immediately the next morning. I feel like my trust issues with complete strangers are seriously shaken and that her cunning behavior was something that I haven't had to deal with for a very long time. I'm still in a little bit of shock, but hopefully time will heal this thing. In the mean time, I am praying for another roommate, hopefully someone honest, nice and open to discussion and certainly not someone cunning, deceitful and devious. Any good wishes are greatly appreciated.