Another ending could be that they both end up in unhappy marriages with other people. They might have given up on their love for each other due to family or social pressure, and now are stuck in relationships that lack the love they once had for each other. They might look back on their time together with regret.
I'm not sure specifically what 'ladka aur ladki ki sad story' is without more context. It could be about a boy and a girl who faced some difficulties in their relationship, like they had to part ways due to family differences or misunderstandings.
One possible theme could be friendship - perhaps their love grew out of a strong friendship.
One possible ending could be that they get married and live happily ever after, continuing to teach in the same school and inspiring students together.
One possible ending could be that the grandpa's family finally realizes how much they've neglected him. They start visiting him regularly, and he slowly starts to regain his old happy self.
The wolf could sacrifice itself to save another animal or even a human who once tried to harm it. This selfless act would be a very sad but also heroic ending to the story.
One possible ending could be that the fruitcake was thrown away in despair, ending up in the trash.
Perhaps the sad caterpillar's situation gets worse. It fails to find enough food or is finally caught by a predator. This would be a tragic ending for the poor caterpillar. However, its story could also serve as a lesson about the harshness of nature for other small creatures.
The ending could be that the doge's owner comes back and realizes how much the doge has missed them. So, they decide to never leave the doge alone for such a long time again and give it lots of love and attention.
One possible ending could be that they never get to see each other again. Jack fades away into his own world and Elsa is left in her ice - filled kingdom, both with a sense of longing and loss.
Another possible ending could be a life of eternal loneliness. For example, in some stories where a person loses their loved ones due to war or disaster and has to live the rest of their lives in solitude, carrying the pain and memories forever. It's like a wound that never heals.