After months of speculation, Calvin, 30, announced their breakup on Twitter writing: "Myself and Rita ended our relationship some time ago. She is a beautiful, talented woman and I wish her all the best."
Rita, 23, responded a couple of days later, writing: "I don't usually address speculation but I've had an incredible time with Calvin and I will treasure the memories. I've moved on from this topic."
But, far from having moved on, sources say Rita is upset over the break up and determined to get Calvin back.
A source said: "Rita was left embarrassed when Calvin tweeted it was all over. She didn't think he was going to make the announcement, so she was shocked."
Friends of the star say she is struggling to come to terms with the breakup, because Calvin was the only man she could trust.
"She's belatedly realised she's surrounded by nodding dogs, who never say no to her.
"With her career going from strength to strength, she reckons she needs real people around her. Calvin was brilliant for that but he got sick of the hangers on and felt the relationship was going nowhere."
The source added: "Rita still hopes they can work it out, because there was never any great argument between them, but Calvin has been quite clear."
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