Justin Bieber, Selena Gomez not back together, but rumors focus on Gomez's rehab stint

Looks like Justin Bieber and Selena Gomez's relationship is once again under the spotlight. No, the two aren't back together, but reports say Gomez's three-month stint in rehab earlier this year may have been caused by her troubled past with her ex.

Life & Style has reported that mental health issues caused by lupus may have prompted Gomez to take a break, but "her biggest addiction" is always Bieber.

"She became a different person around him. She was extremely jealous and possessive and felt like she had to keep up with him to keep him. So she would drink and smoke, and then she got into weed and partying," a source told Life & Style.

Well, it's a good thing then that they are no longer together because it sounded like Bieber has brought a lot of trouble to her life.

Earlier this month, Gomez told Us Weekly that she did not bring her cell phone with her during her rehab stint, and now she doesn't use her phone all that much. "Only limited people have access to me," she said. Sources say Bieber isn't one of the people who has her number because she is allegedly moving on with her life, and putting the past behind her. It should be noted, though, that this hasn't been verified, so readers are advised to take this with a pinch of salt.

Well, she does look healthy when she went onstage at the American Music Awards and delivered a touching message to people who were "broken" like she was. Gomez said she had to stop because she felt broken inside. "I had to stop because I had everything and I was absolutely broken inside. I kept it all together enough to where I would never let you down but I kept it too much together to where I let myself down," she stated.