Justin Bieber has disappointed fans after revealing he "accidentally" reactivated his Instagram account.

The 22-year-old singer closed down his profile on the social media site two weeks ago, after being targeted with nasty comments about his new girlfriend Sofia Richie, 18, but on Monday morning (29Aug16), Justin's fans were delighted when the singer reappeared on the photo sharing site.

Justin made no reference to his return, with the last share on the site a video of his new puppy Todd. However, his followers commented on his comeback via the Todd video, with many welcoming him back with open arms.

However, it now seems his return was short lived, with the Baby singer insisting he didn't want to reactivate the account.

"Still no Instagram it was an accident," he writes on Twitter.com.

Now many fans have taken to the social media site to express their disappointment.

"bruh if you really cared about your fans and not that childish girl you wouldn't have deactivated @justinbieber," one fan writes.

"@justinbieber better make up your mind," another one adds.

Justin's Instagram account is now deactivated again.

He had previously threatened to delete his account, telling his followers: "I'm gonna make my Instagram private if you guys don't stop the hate this is getting out of hand, if you guys are really fans you wouldn't be so mean to people that I like."

His remark garnered a reply from his ex-girlfriend Selena Gomez, who wrote in a comment: "If you can't handle the hate then stop posting pictures of your girlfriend lol (laugh out loud) - it should be special between you two only. Don't be mad at your fans. They love you and supported you before any one ever did."

Justin hit back at Selena by implying she used him for attention, and their dispute worsened when she responded with, "Funny how the ones that cheated multiple times, are pointing the finger at the ones that were forgiving and supportive, no wonder fans are mad. Sad. All love."

Justin then made the decision to change his account to private, before deciding to delete it completely on 16 August (16).