We all knew it couldn't last forever.

Kristen Stewart and Robert Pattinson have been downright adorable while spending every moment together since he returned from Australia recently, but it has now been announced that he'll be leaving town again for another movie, according to Hollywood Life.

Rob is set to star in the new film Mission: Blacklist, about the capture of Saddam Hussein.

Filmmakers have just announced that the film will start shooting overseas in August, meaning Rob and Kristen will be on different continents again in a matter of months. Sob!

It was said to be hard on the two of them to be separated while Rob filmed The Rover in Australia earlier this year. So we're hoping their relationship can survive the distance yet again.

Making this news especially tough is the fact that Kristen is so happy to be close to her man at the moment.

“This is by far the happiest Kristen has ever been, and she’s more in love with Rob than ever," a source says. "She is absolutely dreading to have to say goodbye to him when he leaves for his next project."

"But she’s just living in the moment and enjoying her time with Rob," the source continues. "She really values their time together and is making every moment special."

Somehow, we have a feeling that the Twilight lovebirds' relationship will be just fine during this additional time apart. Even when one of them is "on the road," they still keep the magic alive!

Source: Hollywood Life