On Gilmore Girls Luke and Lorelai started out as friends and took a slow burn toward romance. They never lost their ability to push each others buttons to keep things fresh and we still don't know if they ended up together forever.
Rory: God! You're like Ruth Gordon just standing there with the tannis root. Make a noise. Dean: Rosemary's Baby. Rory: Yeah. Dean: Well, that's a great movie. You've got good taste. Are you moving? Rory: No, just my books are.