FYI, I have killed every rosemary plant I owned. It seems that as soon as I move it indoors for the winter, it dies no matter what I do.
Don't bring it inside. Leave it outside, and insulate it; ie, bury the pot in the ground so the roots don't freeze, and cover with leaves and burlap. (I got one to survive for 3 years, only killing it last winter when I neglected it.)
I killed every rosemary plant too, before I started doing this.