I think some would say its life's way of trying to better you. I would say its an opportunity to try to be somewhat happy in the lowest times of your life. That way you show life who's in charge (did that make sense? I'm using metaphors with non-metaphors prob confusing) Anyways I'd say everyone has their own reason behind it. But actually living that sadness imo all someone could really ask of you is to take it one day at a time and ride out those waves (as well as getting help if needed and talking to us )