If I had I don't know if I could have lived with the guilt. It would have been breaking the promise I made to Hina-chan, but... you would take care of her if something happened to me, right?
Other options:
no subject
If I had I don't know if I could have lived with the guilt. It would have been breaking the promise I made to Hina-chan, but... you would take care of her if something happened to me, right?