Robert Pattinson may have to reunite with ex-girlfriend Kristen Stewart for the premiere of Breaking Dawn Part 2, but he is reportedly stressed about the impending meeting. Pattinson and Stewart's relationship hit the rock bottom since news of the latter's fling with director Rupert Sanders surfaced. The actress came closer with Sanders while shooting for Snow White And the Huntsman.

"RPatz 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," thesun.co.uk quoted a source as saying.

The couple had been together since they met on the sets of Twilight in 2008.