Fans are left wondering why Justin Bieber has unfollowed his longtime mentor and close friend Usher on Instagram, with some speculating it could be due to a "big" reason.

Almost two decades on, Justin appears to have quietly cut ties with his former mentor Usher, 46, so we look back on their close 17-year friendship. Usher didn’t discover Justin but he was there early on in the Yummy singer’s career, having been brought on board immediately by Scooter.

The first theory about the Usher shade is dark. Some fans are drawing lines between Bieber’s unfollow spree and the ongoing Sean “Diddy” Combs saga. If you’ve missed it, Diddy is currently facing some pretty serious allegations including accusations of sex trafficking and racketeering.

Justin Bieber recently made the decision to unfollow his former team members including Scooter Braun and mentor, Usher. The pop star has had to 'cut people from his life'

The recent decision by Canadian singer Justin Bieber to unfollow his former mentor and friend Usher on Instagram has generated great concern among his fans, unleashing speculation

Justin Bieber unfollows Usher on Instagram Social media users noticed that Usher is no longer one of Bieber's Instagram accounts that he follows. He no longer follows Usher becaus

JUSTIN Bieber fans are concerned for the star after he abruptly unfollowed his longtime pal Usher. Hitmaker Justin, 30, has unfollowed his former mentor and close friend Usher on Instagram,

Discover the fallout between Justin Bieber and Usher on Instagram. Learn about the rumors and allegations surrounding their mentorship.

According to a source, Justin Bieber has a habit of cutting people 'from his life' -- and fans have noticed this as he unfollows his mentors.

Shocking news for Justin Bieber and Usher fans! Bieber has unfollowed Usher on Instagram. Is there a fallout brewing? With Diddy’s recent arrest, fans are connecting the dots.