My Immortal (Piano - Vocal Version)

this is definatly one of my favorite songs on this cd...but i am have trouble deciding what it meens.. i think she lost somone very close to her and it having trouble dealing with it.. but my sister said that this guy cheated on her and shes just shaken and upset about it..i cant believe im the only one writeing for this song but if anyone can tell me what this meens that would be awesome