But its the story of Brazilian model Tati Neves that really stings Gomez.
Neves posted a video of Bieber asleep and shirtless, hinting she slept in the same bed -- and did more than sleep. Bieber's people have denied anything happened, and claimed Bieber is "creeped out" by the video, but Gomez isn't buying the story.
“Selena pretty much knew that Justin and Tati hooked up just by looking at the video of him sleeping in bed,” an insider said. “Justin’s team tried to do damage control by saying how creepy it was that this Brazilian girl sneaked into his room and secretly videotaped him, but Selena didn’t quite buy that excuse."
Gomez and Bieber started dating in early 2011 and ended their relationship in January, and friends say Gomez still has feelings for her ex.
“What Tati said hurts because Selena still has feelings for Justin and doesn’t need or want to know what he’s doing behind closed doors,” the insider said. “She misses Justin. He’s not the same person she fell in love with and she feels sad for him because his ego is getting the best of him.”
Swim Week Miami Beach 2014 [PHOTOS]