Well, 'Kabhi Khushi Kabhie Gham' is definitely one. It's a big, emotional family drama with a beautiful love story at its core. The music and performances make it a must-see. Also, 'Mohabbatein' is worth your time. It combines love, music, and a touch of magic.
One more to recommend is 'Kal Ho Naa Ho'. This movie has a very touching love story along with some great life lessons. The male lead has a terminal illness but still manages to bring love and joy into the lives of those around him, especially the female lead with whom he falls in love. These movies are great examples of Bollywood's take on romantic stories.
In 'Ghost', the love between Sam and Molly is very special. Even after Sam's death, he tries to protect Molly from danger. 'Dirty Dancing' has a great love story between Baby and Johnny. Their dancing and relationship develop against the backdrop of a summer vacation. 'Love Actually' is also a wonderful movie with multiple love stories intertwined. It shows different forms of love, from the unrequited to the newly - found and the long - lasting.
It's hard to name the 'best' as it's subjective, but some popular authors often show up on top - rated lists on fanfiction sites. Check for those with high review scores and lots of followers.
In my opinion, 'La La Land' is a great choice. It combines music, dreams, and love in a unique way. Another one could be 'A Walk to Remember', which is a sweet and poignant love story.
I'd say 'Romeo and Juliet' is a classic example. Their love is passionate and tragic, and it has captured hearts for centuries. The forbidden aspect adds to its allure.