RORY: I know all of this about Dean … I know how great he is. I knew it before you did!
LORELAI: Well, knowing this has apparently not stopped you from dragging his heart all over this town.
A possible reference to the 1981 song “Stop Draggin’ My Heart Around”, written by Tom Petty and Mike Campbell, first recorded as a Tom Petty and the Heartbreakers song. Stevie Nicks from Fleetwood Mac sang on the record, with Tom Petty joining her for the chorus and the bridge. It was released as the first single from Nicks’ 1981 debut solo album, Bella Donna. It was one of the first music videos played on MTV when it launched on August 1 1981, and peaked at #3 in the US.
The song is about a woman who feels weighed down by her relationship, and wishes to part, despite having an emotional attachment to her lover. That does seem to apply to Rory – she does have feelings for Dean, but feels “dragged down” by him.