Things are getting ugly between Justin Bieber and The Weeknd (whose real name is Abel Tesfaye).

Shortly after Selena Gomez’s new beau took aim at her ex-boyfriend with his new song, “Some Way,” in which he croons, “I think your girl, your girl fell in love with me,” Justin, 22, is planning his revenge on the singer, 27!

MORE: 12 Real (and Totally Not Fake) Predictions for Selena Gomez and The Weeknd’s Relationship

“He freaked out,” an insider tells In Touch, exclusively. “He left a voicemail on Selena’s phone, and he knew she would have Abel listen to it. In it, Justin told him to ‘watch out’ because he was going to drop a song that was ‘more real than anything you’ve ever heard’ if Abel didn’t back down.”

Another source notes that the “I Can’t Feel My Face” singer didn’t heed to Justin’s requests and now, “Justin and Abel are at war.”

MUST SEE: Selena Is “Feeling Things She Never Felt Before” With The Weeknd

Selena has seemingly taken sides in the dispute — and not surprisingly, she’s siding with her current flame. She’s even released her own diss track called “It Ain’t Me,” in it, she attacks her on-again, off-again first love with lyrics such as, “We stopped seeing eye-to-eye/And I had enough.”

In the past, Selena has been candid about the fascination with her personal life. In a 2014 interview with Marie Claire, she complained about being constantly questioned about her love life, saying, “I would try to promote something that I loved, and the entire interview would be about my personal life.”

However, Justin is guilty of making his personal life public matters; he infamously punched Orlando Bloom over Miranda Kerr — and those closest to him are afraid it could happen again.

MORE: Justin Bieber Used Kourtney Kardashian to Get Revenge on Ex Selena Gomez

“Justin’s friends are worried that all hell will break loose if he comes face-to-face with The Weeknd,” the source explains to In Touch. “History could easily repeat itself with The Weeknd if they end up in the same room!”

For more on this story, pick up the latest issue of In Touch — and for more exclusive content sign up for our newsletter!