Since 2018, the 29-year-old pop artist and Hailey have been married, and he detests witnessing her struggle.
It breaks Justin's heart to have witnessed Hailey struggling emotionally the way she has been these past few months, a source told Us Weekly.
He knows his wife has a pure heart and loves her more than anything.
Hailey, 26, recently posted about her problems on social media.
In a moving Instagram post, the model admitted to being "fragile" on the emotional front.
"I like to make jokes about how I feel because sometimes it's easier than admitting I'm having a hard time," Hailey wrote on the photo-sharing website.
Since 2023 began, I've endured some of the saddest, hardest periods of my adult life, and my mind and emotions have been weak.
"And I'm sure a lot of other people share my feelings, so please know that you're not alone.
Having stated that, let's continue to support one another. Let's be there for our friends, family, loved ones, and even strangers.
"Let's just be there for each other. Even when it's difficult, let's continue to be there for each other. We are better off working together.
In the meantime, amid rumors of a dispute with the model, Selena Gomez spoke out in favor of Hailey last month.
The 30-year-old singer, who once dated Justin, pleaded with her followers to refrain from criticizing Hailey.
"Hailey Bieber reached out to me and let me know that she has been receiving death threats and such hateful negativity," the brunette beauty stated on her Instagram Story.