A jealous husband barged into his wife’s East Village office Tuesday and pulled a knife on a male co-worker he thought she was having an affair with, sources said.

David Zheng, 31, walked into his 26-year-old spouse’s office on Astor Place at 1:30 p.m. and confronted her and a 29-year-old man, according to law-enforcement sources.

Zheng allegedly brandished a pocketknife and put his arm around the man’s neck. His wife jumped in and was cut on her ring finger, just above the knuckle.

Other workers stopped Zheng, holding him until police arrived.

He was arrested and charged with criminal obstruction of breath, criminal possession of a weapon and menacing.

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