'So Macho' singer Sinitti - who dated the 'American Idol' judge on and off for 16 years - wanted to settle down with the music mogul but is now content for them to be friends.
Sinitta - who recently branded Simon a "horrible cheat" - said: "If Simon wanted marriage and kids we would have stayed together 20 years ago!
"Simon's friendship is the most important in my life. I never knew my father and I don't have a brother or any uncles so he's been the most constant man in my life since I was 14. I couldn't live without him."
Sinitta recently announced her split from husband Andy Willner - with who she has two adopted children, Magdalena, four, and three-year-old Zac - and says Simon has given her invaluable help since the breakdown of her relationship.
Explaining Simon is taking her on a holiday to Sardinia, Sinitta said: "Simon's been supporting me big time. But I've been trying not to turn up on his doorstep in tears too much. Just knowing he's there makes a big difference.
"Andy's taking care of the kids in Hong Kong while Simon spoils me. He's told me to concentrate on all the positive things in life so we'll be having fun - jet-skiing, reading, wining and dining..." Sinitta added she is struggling to come to terms with having to look after her children on her own, especially as Andy is now based in Hong Kong.
She explained to Britain's Closer magazine: "It's really not what I signed up for. I was raised by my mum as a single parent and I know how much she struggled. That's why I ended up having children so late in life because I was determined not to make the same mistakes."
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