Certified good guy Hugh Jackman and universally beloved Ryan Reynolds have been feuding for over a decade — and now, fans finally know why. Anyone who's followed either one on social media has witnessed the good-natured trolling, the ribbing, and the inside jokes, but in a new interview with The Daily Beast, Jackman explains that it all goes back to another member of the superhero universe: Scarlett Johansson.

Initially, when he was first asked about the longrunning grudge, Jackman joked that he had no idea what he was being asked about. However, it was clear that he was deflecting, because he opened up in no time.

"How did it start? It's gone back so long now … God, this is a classic sign where your feud has gone too long, where you don’t even know why or how it started!" Jackman said.

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Back when the two met on the set of Wolverine, Reynolds had just married Johansson (they were together from 2008 to 2011 in case anyone forgot). Jackman added that he and Johansson were friends, so he was just looking out for her. That's when the joking started and, even now, it's still going on.

"I met him back on Wolverine, and I used to ream him because I was very close friends with Scarlett, and Scarlett had just married Ryan, so when he came on set I was like, 'Hey, you better be on your best behavior here, pal, because I'm watching,'" he explained. "And we started ribbing each other that way, and then it all escalated with the Deadpool thing and him calling me out, and trying to manipulate me through social media to do what he wanted."

The most recent jab came from Reynolds, who told Jackman's wife, Deborra-Lee Furness, to "hang in there" on the couple's 24th wedding anniversary. Last year, Reynolds tried to convince the entire country of Australia that Jackman had them duped and that, in fact, Jackman was a jerk — and Canadian.

"He's just an evil person," Reynolds said on Today Show Australia. "I mean, you guys have all been duped. You think he's this benevolent ambassador to your country. People don’t realize he's from Winnipeg, Canada."

Right before that, Jackman had photoshopped himself into one of Reynold's movie posters, writing, "A small edit to make this a much better promotional tool."

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