I hate the question "why".
Mostly because it begs some sort of lame attempt to make sense of non-sensable events.
Many endure negative, unloving, ill-paired relationships.
Others live alone, or with Jack Daniels.
But others live well, and love deeply, fiercely, sincerely.
unavoidable, poingnant pain.
does it feel like hunger?
or adrenaline overload?
Nothing much can be done.
not much can be answered.