The incident is the latest in a grim roll of cases of violence against women over which there has been sustained public outrage even as dark clouds hang over a lawmaker.
The woman was left completely nude after several persons rushed to her rescue, using counter flour and a blanket to put out the fire that had engulfed her.
The police, who were early on the scene, rushed the woman to the Noel Holmes Hospital, where she was admitted in a critical condition.
The boyfriend, who is said to be from Westmoreland, is now being sought after fleeing the scene.
Reports are that the couple, who operate a car wash and bar at Great River, were at the location at about 4:30 p.m. when the boyfriend accused the woman of disrespecting him. In a fit of anger, he reportedly doused her with the flammable substance before setting her ablaze.