Stefan Salvatore's last words in The Vampire Diaries were "I love you." He said these words to his brother, Damon, as he passed away peacefully in Damon's arms. This poignant moment occurred in the series finale, "I Was Feeling Epic," after Stefan sacrificed himself to cure Damon of vampirism.
Stefan's final words were a testament to the deep love and complex relationship he shared with his brother throughout the series. Despite their many conflicts and betrayals, their bond ultimately remained strong, and Stefan's last act was a selfless act of love for Damon.