It's never fun finding out your ex has moved on!

Kristen Stewart arrived at LAX to board a flight to Japan this afternoon, and while the actress is normally somewhat moody, she seemed even more down in the dumps than usual when we caught her heading into the terminal. We have a feeling the reports that her former boyfriend Rob Pattinson has a new girlfriend are not sitting well with the grunge goddess!

Although, the Twilight beauty spent almost all her recent days off in L.A. with close gal pal Alicia Cargile, so part of us wonders if she's over men and testing out the romance waters with a lady? If that's the case, she can't be too upset about R-Patz coupling up with British singer FKA Twigs!

The Clouds of Sils Maria star is heading back to Asia to continue filming Equals with co-stars Guy Pearce and Nicholas Hoult. The movie is a futuristic love story that is set in utopian society where emotions have been eradicated. The science fiction flick is slated to hit theaters in 2015.

It's tough to keep up with Robsten and their respective rumored lovers!