I am sorry for all the promises I made.
I am sorry that I am leaving you now. I have found a new love despite promising never to let you go.
I am sorry for the way I let you break my fragile heart.
I am sorry that I could not do anything to stop you from leaving.
I am deeply sorry that I can't bring you back to this world. I am sorry because I am completely helpless.
I am sorry for all the promises I made while you were here.