Robert Pattinson is dreading the promotional tour of the final Twilight film because he does not want to see his cheating ex girlfriend, Kristen Stewart.

The actor is said to be heartbroken after pictures emerged last week of Kristen Stewart’s affair with filmmaker Rupert Sanders.

26 year old Robert and Kristen will be expected to attend premieres together as they promote Breaking Dawn: Part Two, which will be released in November.

A source told Perez Hilton: “He is in pieces but the Twilight love triangle storyline is nothing without him and Kristen.

“It is eating him up that he has no choice but to see her again because of work. His humiliation is total,” said the source.

The couple pictured in 2008

Twilight’s production company is said to be worried that the break up will affect the star’s promotional obligations.

“There’s ­serious concern about the ­promotional tour, which is set to kick off in October.

“This is a potential nightmare for all involved. Fans look forward to seeing them together during interviews. It’s great publicity for the film.

“Robert even used to be happy to go to events with Kristen that he wasn’t contractually obligated to go to, like the Teen Choice Awards last Sunday,” said a source close to Summit Entertainment.

The actor hasn’t been seen publically since he moved out of the apartment her shared with Stewart last week.