Gomez, 25, quickly went back to Bieber, 23, after her relationship with The Weeknd, 27, "fizzled-out" and she's dreading he will exact revenge in the shape of a revealing expose.
The source told RadarOnline.com: “She’s terrified he’ll do a sit-down interview, spilling intimate details about their romance and how badly she screwed him over.
“Abel’s very angry and vengeful right now, his hatred for Justin is off the charts and not a day goes by he doesn’t go on the warpath."
“He’s a sensitive guy, there have been a lot of tears, and his main source of comfort has been to talk about it with friends.
“The next step will be going public, and Selena’s terrified.”
Gomez and Bieber have been seen out on several public dates since getting back together.
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