There is not much information widely known about a pure 'love story' in a modern sense between Chandragupta Maurya and Nandini. Chandragupta Maurya was a great emperor. Their relationship was more likely to be influenced by political and power - related factors in the context of that historical era.
I'm not very familiar with the specific Aditya Karikalan and Nandini love story. It could be a story from a particular regional folklore or a specific literary work.
I'm not entirely sure about the specific ending story of Chandra Nandini as it may vary depending on different interpretations. However, generally in historical or fictional accounts related to such characters, it could end with the resolution of political intrigues, power struggles, or personal relationships.
In the Ponniyin Selvan novel, Nandini undergoes a series of events that shape her character. There are love triangles, power struggles, and unexpected turns that impact her.
Another theme might be secrets and betrayal. For example, one of them could be hiding a big secret from the other, which when revealed, leads to a dark turn in their relationship. It could also involve themes of obsession, where one character is overly obsessed with the other, causing distress and a sense of unease in the relationship.