The 'Come and Get It' hitmaker - who was seen cuddling up to her on/off boyfriend at the Coachella Valley Music and Arts festival earlier this month - is said to have been infuriated by the 'Boyfriend' hitmaker's closeness to the reality TV star, despite them hanging out as a group, along with Kylie's sister Kendall, at the Californian event. <br /> <br />A source said: "Selena is convinced something has gone on between Justin and Kylie. <br /> <br />"At Coachella they looked to be back on track. Selena was hanging out with Kylie too and they were behaving like best friends. <br /> <br />"Then she heard stuff about Justin and Kylie and felt totally betrayed. She went berserk and called it all off again." <br /> <br />The 21-year-old star is said to be "overcome" with jealousy and has unfollowed the Jenner sisters on Instagram and deleted all her pictures with the pair. <br /> <br />However, friends think she is channeling her emotions in the wrong place and want her to focus on cutting Justin out of her life. <br /> <br />The source added to The Sun newspaper: "Selena is in a really bad place at the moment -- she's on the edge and now overcome with jealousy. <br /> <br />"She really needs to wash her hands of Justin for good." <br /> <br />It was recently claimed that friends are worried about Selena - whose underwent a brief stint in rehab in January as they think she behaves "like a different person" when she is with the 'Beauty and a Beat' star and they don't think she should have resumed their three-year on/off romance again. <br /> <br />A source said: "Selena is now acting a little brainwashed and not challenging a thing Justin says. There was a time not long ago where they were fighting and arguing about their relationship, but now she's like a robot and completely in his thrall. <br /> <br />"Whatever he did to keep her from moving on from the relationship worked a little bit too well, because it's like she's a completely different person.”
