I have worked on many scenarios in my mind. None of the scenarios actually ended up with I having you in my life.
The glaciers will have to melt someday, and so you will say. The ocean floors have to heave now and then, sending unforgiving waves crashing on to unsuspecting lives. Gravity, you would say, is the glue that joins parallel universes. And universes keep falling into each other all the time. Time is fluid. It is not a linear variable. Time is a different thing to a fruitfly and to a child on her winter holiday.
I have explored all your definitions. Not one defines closely, how it will be, when you are no longer with me.