The singer said he's "exhausted" by thinking about himself all the time while posting what appeared to be text of a nasty break-up with a former friend.

The musician has shared another series of Instagram posts that speak to his recent struggles with paparazzi, his interpersonal relationships, and internal battles stemming from fame

Justin Bieber has had some very public struggles in recent years, and several of them have involved issues with his physical and mental health.