Not necessarily. A story can have a variety of endings, and a happy one isn't the only option. Sometimes, a bittersweet or even tragic ending can be more impactful and memorable.
It really depends. A story's ending should fit the tone and theme of the narrative. If the journey is filled with challenges and hardships, a happy ending might seem forced. Different endings can evoke different emotions and leave a lasting impression on the readers.
No, a story doesn't always have to end happily. The purpose of a story is to convey a message or tell a meaningful tale. An ending that's not all sunshine and rainbows can offer deeper insights and make the story more thought-provoking.