Girl finds out she is dying and confides in her best friend. OR she could get into an accident when her best friend is with her and has to make a split decision. She has always loved him and he feels the same but they had never told each other. He says he can save her. [the HOW is up for debate. Could be magic, immortality (vampire, werewolf, etc...)] She is torn between dying naturally or choosing life, whatever the cost.