Fell in Love With a Boy
singer had been dating 19-year-old Danny Radford since late last year but the builder - a lifetime friend of the star has decided he can't cope with her fame and moved abroad to start a new life.
A source close to 21-year-old Joss said: "Danny adores Joss but he couldn't cope with her constantly being away."He's upset but wants to make a fresh start. Joss seems OK about it."
Joss and Danny, who grew up together in Devon, were described as "inseparable" when they first took their relationship to the next level.
A source said: "Whenever Joss is home from Los Angeles they're inseparable. "One of the reasons they work so well is that Joss trusts him completely."She knew him before she was famous and he has been close to her family for years."
Joss is currently on a low-key tour of intimate venues across the UK in preparation for the release of her next album in April.