LOS ANGELES: Looks like sometimes it’s difficult to get over your ex, even in Hollywood.

The ‘Twilight’ series stars Robert Pattinson and Kristen Stewart were dating once upon a time, but have now broken up. While Robert Pattinson has moved on to Dylan Penn, Kristen Stewart is apparently still stuck on Robert Pattinson.

“Even though Rob is dating (someone else), Kristen is convinced that what she and Rob had was one of a kind, that their love for each other was one of a kind and can never, ever be replaced,” said a source close to Kristen Stewart.

Kristen Stewart and Robert Pattinson played Bella Swan and Edward Cullen respectively in the five films of the ‘Twilight’ series, which got them a lot of fans and eyeballs.

The source also added, “Kristen still misses Rob, but finds comfort in knowing that what they shared was the best thing that ever happened to her.”

Tough luck for Kristen Stewart though. Even if this is true and Kristen Stewart still misses Robert Pattinson, the latter has clearly moved on, what with appearing publicly with Dylan Penn on quite a few occasions. Maybe it’s time for Kristen Stewart to look to greener pastures as well.