Relationships take up energy; letting go of them, psychiatrists theorize, entails mental work. When you lose someone you were close to, you have to reassess your picture of the world and your place in it. The more your identity was wrapped up with the deceased, the more difficult the loss.
Undo it, take it back, make every day the previous one until I am returned to the day before the one that made you gone. Or set me on an airplane traveling west, crossing the date line again and again, losing this day, then that, until the day of loss still lies ahead, and you are here instead of sorrow.