A British hairdresser was sentenced to life in prison last week after she plunged a knife into her boyfriend’s heart — because she felt he spent too much time on Facebook.

Terri-Marie Palmer, 23, broke down in tears as she was convicted of 24-year-old Damon Searson’s murder following a one-week trial, where the details emerged about the fatal end of their rocky relationship, according to multiple reports.

Moments before the killing, Palmer posted: “He p***** me off sitting on Facebook, completely blanking me when I’m talking to him,” according to The Mirror Online.

She regularly posted on the social media site about how Searson would ignore her while scrolling through Facebook messages on his phone, adding random girls and posting shirtless photos of himself.

“Gross,” she wrote on one of his topless pics.

“Didn’t expect any different to come out of your mouth f–king b–ch,” he fired back.

Eventually, Palmer texted her man that she was fed up — and furious.

“Crying myself to sleep for the second time this week and it’s only Wednesday. Thanks Damon. I’m so angry and hurt I honestly want to f–king stab you,” she wrote, according to The Mirror Online.

The two met at Palmer’s hair salon, Costa Del Sol in Lancaster, England, and moved in together last July.

But by August, Palmer said she planned to leave him, complaining that she had to pay his way, since he was unemployed, and that he was also becoming possessive.

On Aug. 14, she stabbed him to death — leaving the bloody bread knife on the floor and telling cops he had harmed himself, according to the reports.

Palmer will have to serve at least 12 years in the slammer before she is up for parole.