I dont understand?

I am trying to understand Alanis Morissette's song Guardian but I can't get some parts. Please help me someone. In the first verse she seems to really say good things about the person:

You, you who has smiled when you’re in pain
You who has soldiered through the profane
They were distracted and shut down

But then she gets angry and says:

So why, why would you talk to me at all
Such words were dishonorable and in vain
Their promise as solid as a fog

Is she talking to the same person? Why the sudden change? What does it mean? And in the third verse:

You, you in the chaos feigning sane
You who has pushed beyond what’s humane
Then as the ghostly tumbleweed

What does the ghostly tumbleweed mean? Is there some some special meaning? And at the end everything seems to be over, because she writes:

Now no more smiling mid crestfall
No more managing unmanageables
No more holding still in the hailstorm

Is it because the person is safe or what? Thanks to any kind person who helps me. I am most grateful.