A photo provided by Ms Irina Bolgar shows her with Pavel Durov in Venice in April 2013. GENEVA – For many of their nearly 10 years as romantic partners, Ms Irina Bolgar said, she and Pavel Durov enjoyed a luxurious lifestyle. The extravagance grew as Telegram, the messaging app Durov created, became a worldwide hit and cemented him as a billionaire and one of the world’s most powerful tech executives.

During the summers, they would spend about US$1 million (S$ 1.29 million) for a month at a 116-acre resort in Sardinia. In Dubai, United Arab Emirates, they stayed in a beachside penthouse with its own elevator.

Private planes ferried them to Paris, Italy and Monaco. But something changed during that period, according to Ms Bolgar, who is now entangled in a legal dispute with Durov. She said he morphed from a principled entrepreneur whom she admired into an increasingly arrogant, controlling and finally abusive adversary.

According to a Swiss criminal complaint Ms Bolgar made in 2023 against Durov, he abused their youngest son five times in 2021 and 2022. On one occasion, Durov struck the child in the back, sending him across the room, she said. In another, he shook him so hard, the boy’s shoes came off.

Later, he grabbed the child by the leg and said he would kill him. The details are included in public documents related to the criminal case, which was previously reported by Forbes. The files do not list the names of Durov, Ms Bolgar and the children, but there are a numb.