NYC bartender fatally stabbed by enraged boyfriend told coworkers ‘relationship was not going well,’ officials reveal

The Queens bartender fatally stabbed by her boyfriend was thinking about moving back to Ireland after telling her coworkers “the relationship was not going well,” officials revealed Wednesday.

Marcin Pieciak, 36, was slapped with murder and criminal possession of a weapon charges Wednesday for the gruesome attack on his Irish girlfriend, Sarah McNally, inside the Ceili House pub over the weekend in Maspeth.

Pieciak, a pub regular, briefly spoke to customers before “simply walking behind the bar” and pulling out two knives and slashing his doomed gal pal multiple times in the throat, Chief of Detectives Joseph Kenny said at a briefing.

The enraged boyfriend — who met McNally, 41, while she worked at the hole-in-the-wall — then tried “to slice his own throat several times,” according to Kenny.

“She was just standing there talking,” a female patron, who witnessed the bloodshed, told The Post.

“Her boyfriend came in…and he just walked right in and stabbed her. Then he started trying to stab himself. Horrible. Just horrible!”

When Pieciak tried to flee, a customer tried to stop him until police arrived, prosecutors said.

McNally — a Longford, Ireland native who lived with her boyfriend in Glendale — was rushed to a local hospital but could not be saved.

She recently told pals the relationship was on the rocks and thinking about possibly returning to Ireland, Kenny said.

Her family was left grieving after the devastating attack, her aunt said on Facebook.

“Rest in peace my beautiful niece Sarah, we are heart broken, Love you always,” McNally’s aunt Mary posted on Easter Sunday.

Meanwhile, Pieciak remains in stable condition at Elmhurst Hospital, where he was arraigned and pleaded not guilty to the charges on Wednesday.

Judge Julieta Lozano remanded him into custody.

Queens District Attorney Melinda Katz said the attack “shocked” the Queens community.

“It was unprovoked and a devastating loss for the family,” Katz said. “We are using every resource to make sure there is accountability.”

Pieciak’s next court appearance is scheduled for April 5.