Facebook COO Sheryl Sandberg split with billionaire Bobby Kotick after three years amid building pressure at work and calls to break up the social media giant.

Sandberg, 49, and Activation Blizzard CEO Kotick, 56, began dating in 2016, a year after the loss of her beloved husband, Dave Goldberg. At the time, sources said Kotick was a huge source of strength for Sandberg.

But Sandberg has more recently been on a worldwide “apology tour” to re-energize Facebook after it was reported in 2018 that she oversaw an “aggressive lobbying campaign” by research firm Cambridge Analytica — which accessed Facebook users’ data for political purposes ahead of the 2016 election.

CEO Mark Zuckerberg reportedly blamed Sandberg, author of the smash hit “Lean In: Women, Work, and the Will To Lead,” saying she should’ve been more aggressive in controlling the storm. Sandberg began spending “more . . . time safeguarding the company.”

A source close to the former couple said, “Sheryl is under a huge amount of work stress right now. And she and Bobby are very different people. She’s a left-wing Democrat who takes herself very seriously. He’s a registered Independent, if he wasn’t a very, very successful businessman, he’d probably be a stand-up comedian.”

Goldberg died in Mexico in 2015, and Sandberg told the Guardian in 2017 about her new relationship with Kotick: “Men date sooner, men date more, and women get judged more. And, you know, obviously that’s super unfair. I think I’m helping people remember that dating, for those who want to do it, is part of moving forward … If I could I would only date Dave … I just had that taken away from me.”

Reps for Sandberg didn’t get back to us, and calls to Kotick were not immediately returned.