Justin Bieber was reportely dumped by Selena Gomez because she didn't approve of the influence that his new hip-hop music friends were having on him.

Lately, Bieber has been spending more time with Chris Brown, Sean Kingston, and Lil Wayne.  

Last weekend, Justin Bieber and Sean Kingston were driving in South Beach in a Rolls Royce convertible and were pulled over by a cop who became suspicious that young people were driving such a pricey car. Even though they didn't violate any law, Gomez was disturbed by the attention Bieber was receiving.
 
Not to forget, Chris Brown was charged with assault and making criminal threats after he famously abused ex Rihanna and had her hospitalized in 2009. 

Last year, Lil Wayne was jailed for pleading guilty to possession of a weapon.

A source said that the final straw was when Bieber took Kingston to watch her perform, which upset Gomez very much.

"Selena told him to stop hanging with these bad people. She didn't want him to crash her gig," said the source.
 
A huge fight ensued, and ultimately left 17-year-old Bieber in tears.