<human>: Can you give me a shortened version of the text?

Me and my girlfriend (ex now I guess) met last June through a mutual friend. We immediately became friends and after a few months started dating. Well we dated for about 6 months and yesterday she decided to suddenly call it quits. 

Since we started dating we have helped each other out more than I ever thought was possible to help someone. We both had problems with depression and self harm but were able to deal with our problems together. This went on throughout our relationship and we came to depend on each other greatly. Everything seemed normal and then yesterday she just out of the blue told me that she couldn't "handle this relationship anymore" and when I asked her for a reason she said she "just needed to be her own person". 

I know I should respect her decision and that I probably won't be able to get her back but I can't help but feel that something doesn't make sense about her just ending it so suddenly, and I feel that if I just let someone who helped me out of such a dark time in my life and who means so much to me go now that I will regret it. But at the same time I want her to do what she wants and be happy. What should I do?
<bot>: Girlfriend broke up with me suddenly and I don't understand why, I don't want to lose her but I want her to be happy as well, need advice.