You are describing the price we pay for being the lovers that we are. We have the pure caring, the intense focusing, the wishing for the best for them, the... love for them. Nobody else has that capability. You do. I do. We do.

But, it's the nature of who and what we are. We all die (end of our caring for them as they "age" out or move away) but our spirit still permeates the world we lived in (our love still continues; Hers and Yours.)

While you are still alive, live life to the fullest you can.
While you have Someone special in our life, love them to the fullest you can.

Hugs to you, my loving compatriot.