Kristen Stewart and Robert Pattinson have been inseparable since he returned from Australia mid-March and now fans of the couple get to learn why.

According to Pattinson's co-star in the film, The Rover - which he was away filming in Australia for a nine-week shoot - the British hunk "went crazy" during his trip Down Under. Pattinson's co-star, actor Guy Pearce, revealed that Pattinson didn't adjust to life well where they were shooting the sci-fi film.

Pattinson missed Stewart during their trial separation and had a hard time adjusting to the climate in the outback of South Australia, said Pearce.

"Well, he struggled with the flies and the heat," Pearce reportedly told Hollywood Life, adding,"I didn't man him up, but the others manned him up," and Pattinson eventually "had a nice time" with the other co-stars.

David Michod, the film's director, also shared Pattinson's disdain for the flies.

"He's very smart. It's been one of the beaut experiences [for him] ... to roam around and breathe fresh air, but the flies are driving him crazy," said Michod.

Pattinson recently spent three days with Stewart at Coachella 2013. The On The Road actress - who has reportedly decided to hold off working to focus on her relationship - was overheard saying that she is ready to take her relationship with Pattinson to the next level; she is ready to get married.

A source reportedly told British magazine Grazia they oveheard Stewart saying, "Rob and I will get married" at the festival where they were was seen displaying non-stop PDA consecutively for three days.

The 23-year-old was heard saying that their relationship is going so well that she is ready to take the plunge, partly because they are already in an exclusive relationship. The report also revealed that Stewart was wearing a commitment ring there. It is the same item he gave Stewart on her birthday earlier this month.

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Kristen Stewart Robert Pattinson, Kristen Stewart, Robert Pattinson