The '80s singer, who scored hits with tracks such as 'So Macho' and 'Toy Boy', confirmed the news yesterday.
"It is very sad. I loved him deeply for many years and it was never meant to end like this," she told The Sun.
"But sometimes somebody does something and it disturbs you so much there's no option but to end it."
In 2008, Sinitta adopted two children with the investment banking headhunter.
The 49-year-old's former boyfriends include David Essex, Simon Cowell and Brad Pitt.
> Sinitta: DS Icon