Though many character exits on TV have disappointed me, some are so unfair, mean-spirited, or poorly written that they bring out my righteous indignation. Because all shows end, every character will eventually leave the audience. Like many people, I become emotionally invested in my favorite TV characters, wanting them to thrive and be happy. When done right, endings feel earned and fit the established characterizations and storylines.

https://screenrant.com/tv-characters-never-got-happy-ending-disappointing-list/