Hell hath no fury like a woman scorned.
Last month Jimmy "Cosmo" Cournoyer was sentenced to 27 years for leading a $1 billion drug ring which moved hydroponic bud into New York and powder cocaine into Canada with alleged involvement from the Bonanno and Rizzuto Mafia families, motorcycle club Hells Angels and Mexico's Sinaloa cartel, and apparently the investigation was launched by a tip from the jilted girlfriend of some Queens dealer as reported by Alan Feuer for The New York Times: "what began that day with a woman scorned unfolded over the next seven years into an investigation that went beyond the wildest imaginings of the agents assigned to it."
Indeed, domestic dysfunction often can be the loose thread which investigators pull to unravel a criminal conspiracy. Heck, the federal investigation which targeted class action law firm Milberg Weiss had its humble origins "with a bitch slap" in a lover's quarrel as reported by Peter Elkind for Fortune Magazine. And in 1953 when Anna Genovese wasn't happy with the divorce settlement from hubby Vito she disclosed all his hidden interests in Greenwich Village gay clubs to the liquor authorities.
Just because the girl is bitter doesn't mean she isn't telling the truth.