The Sky Sports presenter said that the pain of her split with the Red Or Black? host in April had been heightened by the press attention in their personal lives.
"Having just picked myself up and dusted myself off with some dignity, my focus now is to move forward in the best way," she told The Mail On Sunday.
"Having our break-up played out in public was a very hard thing to deal with. I have got through it with the help of my brilliant group of friends and family and through work."
She added: "I think people did think we were a good couple. I hope what they saw was that we were real people. There are some couples who want to live their life in public, but for Dec and me that was never an option. He has always been very private and we were rarely seen out together.
"I hoped the relationship wouldn't end but it did, and that's the end of the story. Everyone has their own idea of how they want to live out their life and I want mine to be full of fun and laughter."
Thompson also revealed that she is still on good terms with Donnelly's comedy partner Ant McPartlin and his wife Lisa.
"'I have nothing but good words to say about them and the way they were happy to accept me into their group of friends," she said.
"The more time I spent in Ant and Dec's world the more I appreciated it because I realised how important that trusted close-knit group of people is to them in keeping them grounded."
Thompson reportedly claimed that her break-up with Donnelly came "like a bolt out of the blue".
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