Justin Bieber is reportedly convinced that Selena Gomez is the only one for him.

Weeks after the on-again, off-again couple reunited after over a year of estrangement, a source claims the 23-year-old singer believes that Gomez is "the one" and is no longer interested in courting any other women.

“As far as Justin is concerned, Selena has always been ‘the one’ and no other girl has ever come even close to her,” a source close to Bieber told Hollywood Life on Dec. 10. “Not only do Justin’s family and friends love Selena for who she is, they also love her for the calming affect she has on him."

As fans well know, Bieber has endured a number of ups and downs in recent years, including alleged assaults and a number of driving infractions. He's also embarked on a number of alleged romances with the likes of model Hailey Baldwin, reality star Kourtney Kardashian, and actress Nicola Peltz. That said, the singer seems to always make his way back to Gomez.

"When things have gotten really hectic for Justin, it’s always been Selena that can talk him down from the ledge, better than anyone else," the insider continued to share. "Even when they’ve fought in the past, or been on a split, Justin has always known in his heart of hearts that he and Selena would be together again in the future."

In August of last year, Bieber and Gomez were involved in a major fight with each other on Instagram after the "Wolves" singer called Bieber out for sharing an image of Sofia Richie on his page. At the time, Richie had received tons of hate from Bieber's fans, resulting in Bieber threatening to make his account private. As Gomez pointed out, Bieber shouldn't take aim at his fans because they are the ones who have stuck by him throughout his career.

Gomez and Bieber first got back together at the end of October around the time of her split from The Weeknd. Then in the weeks that followed, they appeared to be involved in a full-blown romance as they continued to be photographed together in Los Angeles.

Gomez and Bieber haven't said a whole lot about their decision to get back together, but they have been spotted kissing in public.