She escapes to a place inside her head

Sometimes, you just need to be alone.
Sometimes, not even your best friend needs to know.
Sometimes, you need to put up the walls
so you can examine yourself in the peace & quiet.
Sometimes the loud sounds need to fade away,
leaving only the silence & you; that's it.
I'm putting my walls back up,
never tearing them down again or letting people through.
I should have never let you.