A woman revealed she once found out her boyfriend had been cheating after receiving a notification from his Fitbit —saying he burnt 500 calories in the middle of the night.

Nadia Essex, 39, who is known for her expertise on Celebs Go Dating, shared a TikTok video recalling the time a smartwatch helped her find out about her ex-boyfriend’s infidelity.

Essex responded to another TikTok user, who’d posted the topic: “Stitch with the moment you knew your relationship was over.”

In Essex’s TikTok video, she recalled her boyfriend came home from a night out, and that she received an unusual notification from his Fitbit, having previously synced their smartwatches.

“Oh honey, I’ve got a doozie,” Essex said in the video. “So when my ex-boyfriend came home from a night out, I woke up in the morning and thought, ‘Let me make some breakfast’”

“And I got a notification on my Fitbit —the Fitbit that we’d synced together— that between 2 o’clock and 3 o’clock in the morning, last morning, he had burned over 500 calories!”

While the 39-year-old did not confirm what the weird calorie burn was, she confirmed her followers’ suspicions by smiling at the camera and saying: “I shoved that breakfast where the sun don’t shine, darling.”

Essex’ TikTok video has since racked up more than 446,000 views and 48,000 likes, along with hundreds of comments showing support to the dating expert, referring to her as a ‘queen’.

“That is the best, but defo worst, story,” One commenter said. “You’re so much better without him.”

“Well at least you found out,” another TikTok user said. “Who knows how long it would’ve carried on for it you hadn’t!”

Some other users also tried to give her ex-boyfriend the benefit of the doubt, with one saying: “I was about to say he could have been dancing in a club but if you knew what he was really doing…”

Replying with a couple of laughing emojis, Essex then commented: “He wishes that was what it was.”