Fun Psychology facts here! You mean to tell me you think this fact is FUN? Nothing about depression is fun. Not a single angle of it. Even if that was on psychological things, and not depression. It shouldn't be marked as a FUN fact.
The saddest part in life is saying Goodbye to someone you wish to spend your lifetime with. The saddest part in a life would be to spend a lifetime with someone who didn't really want to spend theirs with yours.