She’s recently been looking loved up with Richard Branson's nephew Ned RockNroll.
The Oscar winner met fun-loving Ned – who changed his name from Abel Smith – during a getaway at the magnate's Caribbean retreat on Necker Island this summer.
But former flame Louis Dowler (pictured below), who had accompanied Kate and her two children on the holiday, has indicated that their break up left him devastated.
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Speaking to the Daily Mail, the Burberry model said: "I don’t think Kate behaved well and it is still very raw for me.
“I was in love with her and you can’t switch that off overnight,” he added.
“I don’t want to go into details but it wasn’t a straightforward break-up.”
Kate has been spotted kissing her new beau Ned (below), but Louis hasn’t yet been able to move on.
”I’m a laid-back guy, so I am not walking around with a long face — but I do still hold a torch for her.
“I thought we were inseparable. I certainly haven’t found anyone else since.”
Louis and Kate met shortly after her split from film director husband Sam Mendes, the father of her seven-year-old son Joe. The actress admitted she found the end of their relationship extremely hard to deal with.
She was also married before – to director Jim Threapleton, with whom she had her daughter Mia Honey, now 11.