Selena Gomez‘s mother, Mandy Teefey, voluntarily went to the hospital to be checked out by doctors last week. But rumors suggesting it was because of an argument she had with Selena over her relationship with Justin Bieber are untrue. “It’s been a stressful time for Mandy and she made the decision herself to go to the hospital and make sure everything was okay. This wasn’t just about Justin,” a source tells People, adding “It’s true her family doesn’t approve of Justin, but this wasn’t just over a fight about him.” And Biebs is committed to making things better. “Justin knows Selena’s family is not happy about her dating him," the source says. "He has known for a long time. But he is adamant that he has changed and is a better boyfriend now. He will keep trying to prove himself to her family."