A video shows an Italian millionaire accusing his fiancé of cheating on him during their lavish engagement party

• An Italian millionaire accused his fiancé of cheating on him during a speech, a video shows.
• Massimo Segre told the couple's many guests that she is in love with another person.

A viral video shows the moment an Italian millionaire accused his fiancé of cheating on him during a lavish banquet to celebrate their engagement.

Massimo Segre, a 64-year-old banker and a board member of the Domani newspaper, gave the toast at his Turin mansion last week.

"I want to give Cristina the freedom to love," Segre said in his speech, which he had written in the form of a letter, according to a translation from The Sunday Times."Specifically, to love another person; a notable lawyer, who she clearly cares about more than me."

"Dear Cristina, I know how much you are in love with him mentally and sexually," he added, according to The Sunday Times. "And I know that before him you had a relationship with an industrialist acquaintance."

"And I know that before him, you were in a relationship with a well-known industrialist. Do not think that I am pleased to look like a cuckold in front of all of you," he continued.

The video, which quickly went viral, appears to show Seymandi watching on in shock as she stands next to her husband. When he finishes talking, Segre leaves the stage and Seymandi appears to follow him, trying, but failing, to get his attention.

After the incident, Seymandi told the Italian newspaper Il Corriere della Sera: "When he started talking, I thought it was a joke. Then I was petrified. It was an act of abhorrent violence," according to The Independent.

Luca Poma, an advisor to Seymandi, told The Sunday Times that she is planning to sue her former partner for "reputational damage," adding that she suffered attacks on social media and threats from Italian citizens.

"It has been traumatic," Poma added.

Seymandi's lawyer, Claudio Strata, also told the outlet: "The letter was read out in front of dozens of people and it was captured in a video that was sent to the newspapers. We don't think this was improvised."

But Segre's lawyers claim that the millionaire "categorically denies having published the video, let alone having allowed it to be filmed". It is unclear who took the video.

Italy's Data Protection Commission said it is investigating the video and how it was leaked, The Sunday Times reported.