Police and rescue workers were called to the scene, in front of the Thalang Health Care Centre, at 11:50pm.
The woman, a 38-year-old resident of Cherng Talay, stood on the edge of the pedestrian bridge and threatened to jump, although the span is just 5.5 metres above the main road.
Police had traffic along the road blocked while rescue workers talked to the woman, tearful and despondent, hoping for her to return to safety.
Their attempts failed, leading police to step in and spend another 50 minutes talking to the woman, finally getting her to come down from the bridge.
The woman explained to police that she was heartbroken, jealous that her female partner for the past year had found a new lover.
She had been fighting with her partner, which led her to climbing the bridge in the though of jumping onto the road.
Police made no mention of any legal action against the woman, though The Phuket News notes that there is a “One Stop Crisis Centre” at each government hospital on the island that can help people cope with emotional distress.
Thai speakers can call the 1300 help hotline.