Abhishek Singh, 40, who hails from Uttar Pradesh's Ghazipur, was discovered dead in a lodge near Rao & Rao Circle in Mangaluru.
Before committing suicide, he recorded a 20-minute video, blaming the woman for his death and uploaded it on Instagram.
Singh, who worked for a private company in Chennai, had come to Mangaluru with colleagues to attend an exhibition.
In the video, he accused CISF Assistant Commandant Monika Sihag of misleading him.
He accused her of hiding her marital status and entering into a relationship with him.
He alleged that she took advantage of him emotionally, physically, and financially, extracting gold worth Rs. 8 lakh from him. He also mentioned that she had similar relationships with multiple people.
A case has been registered and police have started an investigation into the circumstances surrounding his death.