Gomez 'couldn't trust' Bieber

Selena Gomez broke up with Justin Bieber because she couldn't trust him, it has been claimed.

The 20-year-old Disney star ended the two-year relationship last week after Justin was said to be flirting with Hungarian model Barbara Palvin, People magazine reports.

The 18-year-old Baby hitmaker performed at the Victoria's Secret Fashion show while Barbara, 19, walked the runway for the lingerie giant on Wednesday.

The model posted a picture of the pair backstage while she was in her dressing gown.

'Okay sooo because u guys were askin for it! with @justinbieber ! you were great tonight!' she wrote.

The following night Justin and Barbara caught a performance of Broadway's The Lion King together.

The model was forced to ask his fans to 'please calm down' after she tweeted 'The Lion King' with a heart symbol in a veiled reference to the star. 'He is all yours!!' she added.

Selena published a cryptic tweet on Friday of Justin with Barbara in the background, writing simply: '...'

The couple's hectic schedules have been blamed for the break-up. A source told E! News, 'Because of their crazy schedules, it was getting harder and harder to maintain a relationship.'

Justin and Selena went public with their romance in February 2011 after several months of speculation.