Love never dies a natural death. It dies because we don't know how to replenish its source. It dies of blindness and errors and betrayals. It dies of illness and wounds; it dies of weariness, of witherings, of tarnishings.
No matter how close we are to another person, few human relationships are as free from strife, disagreement, and frustration as is the relationship you have with a good dog. Few human beings give of themselves to another as a dog gives of itself. I also suspect that we cherish dogs because their unblemished souls make us wish - consciously or unconsciously - that we were as innocent as they are, and make us yearn for a place where innocence is universal and where the meanness, the betrayals, and the cruelties of this world are unknown.
There are betrayals in war that are childlike compared with our human betrayals during peace. The new lovers enter the habits of the other. Things are smashed, revealed in a new light. This is done with nervous or tender sentences, although the heart is an organ of fire.
Disappointments in love, even betrayals and losses, serve the soul at the very moment they seem in life to be tragedies. The soul is partly in time and partly in eternity. We might remember the part that resides in eternity when we feel despair over the part that is in life.