As reported by Terra.com (Here's my translation from Spanish article):
Robert Pattinson ended his participation in the filming of Water for Elephants in Tennessee and, possibly, go visit Kristen Stewart will be one of the first things to do. However, the actor has a tight schedule and must find a day to meet his supposed girlfriend.
Kristen Stewart is in Montreal, Canada, where she is filming the movie On The Road. The beautiful actress is acting in the film with Viggo Mortensen, Amy Adams, Kirsten Dunst and Sam Riley.
According to various specialized entertainment press, Pattinson made it clear that he felt the absence of Kristen Stewart during his stay in Tennessee. He wasn’t very receptive to his co-workers and in moments of distraction, at night, also looked very quiet.
Also Pattinson reportedly confessed to Hollywoodlife.com, it is difficult to be separate from (Stewart) after having been so long together in the filming of the first three films in the Twilight saga. Added to this are the rumors about the alleged romance between them.
In Water for Elephants, Robert Pattinson stars as a young man working in a circus and falls in love with an artist (Reese Witherspoon). The last scenes were filmed in the town of Chattanooga.
Anyway, Robert Pattinson and Kristen Stewart will get back together in November, when they start to shoot Breaking Dawn, the last part of the Twilight saga, which hits theaters in two episodes, premiering in November of 2011 and 2012 respectively.
You can read the original Spanish article at Terra.com