A Bronx father was shot to death during a fight with his ex-girlfriend’s new beau in a subway station Friday evening, police sources said.

The 25-year-old victim got into the spat with his old flame and her current boyfriend at about 6:30 p.m. in the mezzanine of the B/D station at 167 Street in Concourse Village, the sources said.

The woman’s new boyfriend pulled a handgun during the exchange and shot the man once in the stomach, according to law enforcement sources.

He was rushed to Lincoln Medical Center, where he was pronounced dead, cops said.

No arrests were immediately made and police were searching for the woman and the suspected gunman, sources said.