At that time, he was about to marry the woman who would later become the mother of his first child. However, it did not stop him from thinking about one of his ex-girlfriends before he became somebody else's husband.
Days before walking down the aisle, Prince Harry had an emotional "final call" with his ex-significant other.
According to a report by Vanity Fair, the Prince called Chelsy Davy to acknowledge that he was indeed moving on with his life.
"It was their final call, a parting call in which they both acknowledged Harry was moving on," Royal author Katie Nicholl wrote based on what sources told her last year.
Davy was reportedly quite emotional about everything.
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"She was in tears and almost didn't go to the wedding," Nicholl added.
Eventually, Davy still went and promised Harry she would not try and intrude the party.
The author added that although reports claimed that Davy was present in St. George's Chapel for the royal wedding ceremony, a family friend told Vanity Fair that she did not get an invite to the private evening reception.
The same source said that Cressida Bonas, one of Harry's exes, was also not invited.
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Some of Harry's friends were a bit shocked not to get the "golden ticket" to the evening party.
"There was actually another wedding that weekend that a lot of them were invited to, so they got to have fun in any case," said the Royal author, who confirmed that a lot of Harry's friends were not invited to the reception.
Prince Harry and Chelsy dated on-and-off for seven years but officially called in quits in 2010. During that time, Davy insisted that they remain good friends but hinted that the media intrusion into their romance was too much too handle.
Speaking to the Daily Mail, Chelsy said that it was "full-on: crazy, scary, and uncomfortable."
Davy said she found it very difficult, adding that she couldn't cope because it was so bad. She tried to be a normal kid, but for Prince Harry's ex, it felt horrible.
In Nicholl's biography, "Harry: Life, Loss, and Love," she wrote about Davy's life as a royal bride was not for her. Davy also said to Harry that she could never make the sacrifices Kate had to make.
A Zimbabwe-native, Davy shared that she couldn't cope with the media scrutiny that comes with being romantically linked to the press. After they broke up, she returned to her home country and now divides her time between Africa and the U.K.