AceShowbiz - In an incident that has been widely shared online, Justin Bieber engaged in a heated exchange with a paparazzo. He snarked at a shutterbug while out and about with his wife, Hailey Bieber, in Los Angeles.

After they enjoyed a breakfast date with Hailey at the Beverly Glen Deli, photographers began snapping photos as they made their way to their car. One of them thanked the "Yummy" singer for his time, which set off Bieber. He responded angrily, "That's disrespectful when you thank me, because I'm not asking you to be here, you know what I mean?"

The photographer tried to explain his gratitude by saying, "I'm just saying 'thank you' for everything you do for us," but Bieber was not backing down, "I'm just saying I don't want you to be here, so when you thank me, it's disrespectful. Just take your pictures and let me do my thing, okay?"

The public confrontation occurred just days after the couple had been seen together more frequently, attempting to quell rumors of trouble in their six-year marriage. Despite their united front, sources close to the pair claimed there were concerns about Justin's well-being, citing his erratic behavior and declining mental health.

An insider told DailyMail.com, "He's not working out like he used to, he doesn't seem to eat like he once did, and people can see he has lost weight. It's like he doesn't care about his well-being anymore." The source added, "He's moodier too. People are worried that he's lost any motivation, even for his music."

Hailey Bieber, who shares a six-month-old son named Jack with Justin, is reported to be "deeply concerned over her spouse's mood, work, and diet." The couple's mutual estrangement from their respective families has added to Hailey's stress as she struggles to find support.

Fueling further speculation about his mental state, Justin posted a cryptic message on Instagram saying, "It's time to grow up! Changing is about letting go... I tried to follow the rules. I'm not good at it. But you don't need the rules to enter into a life full of love." He continued, "God always grants us love! It's one of his promises."

This message has sparked rumors of potential drug use, with fans noting his unusual behavior. Footage from a recent event led some social media users to speculate, "If you ever dealt with an addict... the expressions and movements can speak louder," while another commented, "I feel like the ones who feel like he's using are ones who have seen it firsthand."

Only time will tell how Justin Bieber will navigate through these turbulent times, but the public and media scrutiny certainly add pressure to the young star's complex life.