Rita Ora 'left embarrassed' after Harris left her on Twitter
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A source told The Sun: 'Rita was left embarrassed when he tweeted that it was all over. She didn't think he was going to make the announcement, so she was shocked.'
The couple - who collaborated on number one smash hit I Will Never Let You Down - first split in January for a couple of weeks.
Rita, 23, had also been seen partying and cosying up to other men in Instagram photographs and spent time been in Mexico with friends, including R&B singer Khalil Amir Sharieff, who was arrested in Miami with Justin Bieber earlier this year for drag racing.
The source said: 'It was Calvin's decision to end the relationship. They had been arguing for months and had grown apart. She was constantly posting snaps of her with other groups of friends and her trip to Mexico and photos of her with Khalil were the final straw.
'Calvin likes more privacy than Rita and he hated the extra attention that came with being her boyfriend.'
Meanwhile, Justin Bieber is said to have been a factor in the couple's split, with TMZ reporting the Baby hitmaker's amorous behaviour in a recording studio a few months ago was the catalyst for the end of their romance.
A source told the website: 'Word got back to Calvin, Justin and Rita got touchy feely with each other while they were in the recording studio together over the last few months.
Meanwhile, Justin Bieber is said to have been a factor in the couple's split, with TMZ reporting the Baby hitmaker's amorous behaviour in a recording studio a few months ago was the catalyst for the end of their romance.
A source told the website: 'Word got back to Calvin, Justin and Rita got touchy feely with each other while they were in the recording studio together over the last few months.