A 26-year-old man was slashed by his girlfriend’s former fling in Kew Gardens Saturday morning, cops said.

The couple was strolling along in the tree-lined residential neighborhood when the woman’s ex-boyfriend attack her new man on Kew Gardens Road near 82nd Road about 9:50 a.m., police said.

The suspect used a box cutter to slice the victims face and arm.

EMS took him to Jamaica Hospital in stable condition.

The perpetrator fled and no arrests have been made.