London: Former cricketer Shane Warne has been battling to win back his ex-fiancee Liz Hurley with heartfelt messages on Twitter. Warne posted a gushing message describing his ex-fiancee as an 'angel' after seeing pictures of her without her engagement ring at a breast cancer charity event in New York, reported . "Well done on all the wonderful work you do. Hope the week was another huge success. Very proud of you angel. (sic)," he tweeted. The couple reportedly split because the 44-year-old retired sportsman wouldn't set a wedding date, but he is said to be 'desperate' to win the actress back."Shane has hated seeing pictures of Liz without her ring and is desperate to win her back. He's been reluctant to admit things are over and is missing her," a source said.