Do you think in a sane society the problems which make her unreliable as a partner wouldn't exist? Do you think the instability and etc is due to the insane environment, or are these issues deep-seated personality flaws that would exist no matter the society she was in?
Also, I know you desire to be a father though you've abandoned that dream due to a lack of suitable mates. What is it about being a father that appeals to you? What traditions, values and beliefs would you pass on to your sons and daughters? How would you prepare them for their future?
It's good you have a friend who is so important to you, by the way. Everyone needs someone like that in their life.