The private life of Telegram’s founder adds to his troubles

For many of their nearly 10 years as romantic partners, 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 $1 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.