To me, this final scene of 4x15 is the most symbolic and foreshadowing scene of the entire show. We watch the shoes that Elena was wearing when she first met Stefan burn. We watch the diary, in which she wrote only about Stefan as a human, and which Stefan returned to her house the first day they met, burn too. Then the last part; Stefan turns, watching the burning house symbolizing Elena’s human life, and their relationship, turn to ruins. He lingers behind, whereas Damon and Elena walk off together, away from the ruins of Elena’s old life, and Stefan and Elena’s relationship.
On the whole? This scene tells the viewers only one thing, as we watch every symbol of Elena’s old human life and her relationship with Stefan burn; that life is over, and her new life with Damon is just beginning.