She broke his heart — then her lover drove a knife through it.
Slain Bronx resident Luis Cartagena was bickering with his girlfriend over her alleged infidelity moments before the guy she was sneaking around with stabbed him in the heart, according to victim’s grieving mother.
“She cheated on my son with that guy before,” Muneca Sanchez told the Daily News on Tuesday night. “I can’t believe it. She was in my house earlier in the day. What kind of people are these?
