Anyone ever had a stalker?

Some of you might recall that I recently moved house. I was at the local shops when in walks a girl that I used to see for a while, nothing serious. Anyway we exchange pleasentries and go about our business. All of a sudden I cant move for seeing this girl, she drives past my house when she knows I will be leaving, and then ten seconds later she is driving back in the opposite direction, two three times a day, never says anything, never a polite wave as she goes past. She is beginning to freak me out.