It is the turbulent memories of pain, anger and of
course the good time that i hate.
You felt
disturbed by the environment which includes her
presence.
But then actually, it is your
thoughts that are disturbing you, rather than your environment. You
are probably disturbed by the myriad of thoughts, which consists of
her imagery and selective emotional events.
Then again, since you can't
change your environment, you might want to work on that thought
processing.
If you failed to learn
acceptance, then you will always be affected; with or without her
physical presence. 
Cheers
