The deranged ex-boyfriend accused in the vicious ambush murder of his on-again, off-again girlfriend in a Harlem building was charged Tuesday – after whining to cops she had been his “entire life,” cops and sources said.

Luis Marquez, 41, allegedly knifed mother-of-four Carmen Lopez, 47, as many as “50 times” Monday when he attacked her inside her West 129th Street apartment building – where he heartlessly left her to die alone in the hallway, authorities and sources said.

Marquez, of the Bronx, was apparently enraged with jealousy because the victim used him and didn’t make him a “priority,” the sources said.

He described Lopez as his “entire life” to police while in custody though the two were no longer together at the time of the slaying, the sources added.

Building porter Lyron

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