Selena Gomez is done with Justin Bieber because he is just too needy.
According to RadarOnline.com, Justin and Selena split at the end of December for good -- because Selena just couldn't taken Justin's immaturity
A source siad, "Justin is super needy and can be a big baby around Selena. It's hard for him to make real friends because he likes the temporary attention of strangers, but didn't realize how it hurt Selena.
Selena didn't feel Justin was respectful of their relationship. She was constantly catching him in positions with other girls that would make her uncomfortable. She would get super jealous.
Selena is Justin's first love and he's still young enough that he desperately tries to make it work. But Selena is mature enough to just know when to end it and be realistic that it isn't working.
Selena absolutely won't get back with Justin unless he makes some drastic changes in his life."