Demi Lovato is not happy about Selena Gomez reuniting with Justin Bieber. Demi Lovato and Selena Gomez have been close for almost their entire lives, but this long friendship might be coming to a sad and abrupt end. Demi, like a lot of people around the world, is totally sick of the Selena and Justin Bieber never-ending drama and so she's distancing herself from Selena.