They've been on-and-off again for what seems like forever, but now five months after their official split, Robert Pattinson and Kristen Stewart are reportedly hooking up once more in secret, Life & Style reports.

"They've always had a passion for each other," a source told the magazine. "So even though the relationship didn't work out, they still hook up when they're in LA."

After her highly publicized affair with then-married "Snow White and the Huntsman" director Rubert Sanders last year, Stewart and Pattinson allegedly had difficulty maintaining the trust in their relationship, and in May, Pattinson moved his things out of her house in Los Feliz, Calif. and broke things off for good.

"It just consumed him to such a point that they would have occasional banter back and forth where they weren't nice to each other. Her cheating basically opened other doors in their relationship of what they didn't like of each other," another source told Hollywood Life back in August.

Since then, Stewart has been spotted with wrist tattoos that fans speculate represent her eternal love for Pattinson (an infinity symbol) and the four years they spent together (four dashes), and numerous reports have claimed that she's been missing her former beau and having difficulty coping without him, even struggling with depression on the set of her latest film, "Sils Maria." Pattinson, meanwhile, has been linked to several women since the split, including Riley Keough, and most recently, Sean Penn's daughter, Dylan Penn, whom he may now be dating.

Nonetheless, the Life & Style source claims that "Robsten," as they're known by their devoted fans, are still keeping things going behind-the-scenes, although the prospect of an official reunion does seem slim.

"Rob doesn't see a future with Kristen at this point in time, but he likes to hook up with her," said the source. "He's made it clear that they are not exclusive."

Notably, the box set for the "Twilight" films is set to be released on Nov. 2. Are these two really hooking up, or are the reports meant to serve as promotion just in time? It's a question that several fans have brought up, though those who are less skeptical suspect that Pattinson and Stewart still have feelings for each other despite all that has happened.