An ex-boyfriend of the mother of four who was stabbed to death in the hallway of her Harlem apartment building was charged Tuesday with her slaying, police said.

Luis Marquez, who had been drinking, felt disrespected since he felt Lopez was the love of his life but she didn’t feel the same, police sources said.

The pair had been embroiled in an on-and-off-again relationship, sources said.

Marquez is accused of lying in wait in the building’s stairwell for more than two hours before stabbing Carmen Yadira Lopez nearly 50 times all over her body after she stepped off the elevator on her floor around 4:25 a.m. Monday. She could be heard desperately pleading with Marquez not to attack her, neighbors told the Daily News.

Marquez, 31, is facing murder charges for the slaying inside the

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