Ek Duuje Ke Liye
It's story of Vasu (Tamil Man) and Sapna ( North Indian woman) are madly in love but face opposition from their parents. To immortalise their love, both end-up committing suicide, by jumping off a cliff. The film was a Blockbuster. It received critical acclaim upon release, winning a National Film Award and 3 Filmfare awards.
Starring Kamal Haasan, Rati Agnihotri, Madhavi, Rakesh Bedi, Poornam Viswanathan, Satyendra Kapoor, Arvind Deshpande, Shubha Khote, Raza Murad, Asrani
Watch "Ek Duuje Ke Liye" on Amazon Prime released in 1981. It's a drama and romance movie, and has a rating of 7.3 out of 10 from Imdb which is usually fine for this kind of movie.