Harry Styles is rumoured to be getting back together with Caroline Flack.

The One Direction heartthrob split from 'The Xtra Factor' presenter in January, but has now reportedly reached out to her to explain he isn't seeing anyone else.

A source told The Sun newspaper: ''Harry has never quite got over what he had with Caroline. They had such fun together.

''He sent her a few texts just to test the water as a lot has happened since they were together - particularly Harry being linked to a series of girls.''

Caroline, 32, received online abuse and death threats when fans learnt that she was dating Harry, who is 15 years her junior and was 17 at the time. The pair called it quits early this year, saying the break-up was a ''mutual decision''.

The insider added: ''She's a touch wary because of the abuse she got the last time for dating him''.

Harry, 18, has been most recently been linked to 23-year-old 'Made in Chelsea' star Caggie Dunlop after they were spotted cosying up in London's Dorsia club last week.

A source claimed the pair had hooked up, saying: ''She and Harry have been in touch for around a year, but they first kissed about nine months ago.

''Things went cold for a while, but they hooked up on Thursday night and ended up spending the night together.''

'One Thing' hitmaker Harry's representative has denied the rumours, stating: ''Harry is not dating Caggie and is not romantically involved with her.''

The singer is famous for his penchant for older women and reports emerged in June that he had also had a three month affair with 32-year-old DJ Lucy Horobin.

When asked if he prefers mature women, he joked: ''Anything up to my mum's age, she's 44!''