Sunny Deol and Dimple Kapadia were head over heels in love. Sunny Deol debited with Betaab in 1983 which was a love story, so to create a hype for the debutante couple Amrita Singh and Sunny Deol, the news of their affair was circulated. What nobody knew at that time was that Sunny Deol was already married to Pooja/Lynda Deol whose father was a partner of Dharmendra in his motel business in London.
After the stupendous success of Betaab Sunny was flooded with offers. One of the films was Nasir Hussain’s Manzil Manzil opposite Dimple Kapadia who was making her comeback to movies after a decade of hiatus. She had also separated (though not divorced) from Rajesh Khanna. So sparks fly between them and by the end of the film they were clearly in love. But Dharmendra, who himself fell in love with Hema Malini despite being a married man, didn't allow Sunny to do the same. Manzil Manzil flopped and the news was buried.
Next, Dharmendra produced a film for Sunny titled Arjun. Dharmendra wanted Padmini Kolhapure for the film, while Sunny Deol was adamant to cast Dimple Kapadia in the film. Eventually Padmini said no to the film, and Dimple was cast. But Dharmendra didn't like the closeness between the two and warned them to stay away from each other. Arjun was also a success, and the pair went on to do many films together like Aag ka Gola, Gunah, Narsimha but barring Narsimha (that too was a moderate grosser) the films didn't work, but they enjoyed staying together. They also shared a steaming kiss in Aag ka Gola. Dharmendra was so offended by this that he kept a kissing scene with Dimple Kapadia in the film Dushman Devta.
Eventually Sunny Deol, being an obedient son, didn't marry Dimple Kapadia and everybody thought the relationship is over. However a few years ago, an image resurfaced and their romance was once again in focus. Rumours also said that when Sunny Deol faced a financial crisis and struggled to save his bungalow over a debt of 60 crores (due to failure for their productions Pal Pal Dil ke Paas and Yamla Pagla Deewana Phir Se), it was Dimple’s son in law Akshay Kumar who helped him financially to get out of the crisis.
The two actors have not acknowledged their relationship in public but there are lot of hints thrown at different points.
They were seen together in public in more than one occasion most popularly in London. In 2006, 22 years after they were first rumored to be dating, Sunny’s co-star Amisha Patel was asked if Sunny was at her on-set birthday party, and she casually said no, of course not, because “Dimple Ma’am’s” birthday was the day before, so he had to be with her. In 2017, 33 years after their rumored relationship started, they were spotted by a fan sitting in a bus stop in London, casually holding hands.