What the heck is up with my 'best friend'? Why can't she decide one way or another?

Well , Green , as she said she is confused. Her mind is a maelstrom of emotions -gathering from what you say -and she needs some emotional support to cope with such a tempestuous time in her life as now. If you like her tell her so and you're sure to have your affections returned. She seems to be of a mercurial temperament and you as her boyfriend need to be sufficiently fortified to expect sudden changes of mood and prevail through the ebb and tide of love with a stoic air.