The 'Spring Breakers' actress flew to Norway last week to spend time with Justin, 19, even though their split was thought to be permanent and her friends are desperately trying to persuade her not to give him another chance.
A source told RadarOnline: ''Selena's friends are furious that she's giving Justin another chance.
''They've been trying to warn her that he's no good for her and that she should stay away from him, but she just loves the attention he gives her.''
While Selena, 20, has been trying to spend as much time as possible with Justin recently, pals are hoping since they are not officially back together that she will come to her senses soon.
The insider added: ''They've been spending a lot of time together, secretly, over the last couple weeks. But nothing is official between them.
''Being with Selena is good for him, but her friends are adamant that he's bad for her.''
Friends previously explained the brunette beauty initially dealt well with the split because she was busy promoting 'Spring Breakers' with Ashley Benson and Vanessa Hudgens but after the movie premiered last month, Selena had time to reconsider her feelings and reportedly decided she wanted to see the 'Beauty and a Beat' hitmaker again.
A source said: She didn't actually have to think of him cause she was with her girls doing major promotion.''
''She was lonely. That is why she reached out to Justin again.''