The 'Bleeding Love' hitmaker – who recently ended her 15-year relationship with her childhood sweetheart – is said to have been devastated by reports that her long-time love has been attempting to woo British actress Roxanne Pallett.
A friend of the singer said: "Her and Lou were planning to go away and talk. She was hoping for a reconciliation. But not anymore."
According to the pal, the pair, both 25, drifted apart after Lou – a former electrician – landed a job as a scout for Sony music.
The friend continued to The Sun newspaper: "I think he began to feel he was in music and didn't need Leona any more."
It was revealed last week that Lou had been bombarding Roxanne – best known for her role in UK TV soap opera 'Emmerdale' – with flower at the Grand Theatre in Leeds, North England, where she is currently performing in a production of 'Rock Around The Clock'.
A source said: "Last week big bunches of roses arrived for Roxanne with the name Lou on them.
"Everyone was very curious about who they were from.
"She eventually admitted they were from Leona's ex. He's really been pursuing her. He's been texting as well and wants to try to arrange a date.
"Roxanne said she met him in Los Angeles earlier this year and gave him her number.
"She seems very flattered by the attention. Who knows what will happen?"