I think the rest of this cliché is "come to an end". To be equal, all bad things also come to an end. In my experience, the end is as often brought on by personal failures and disappointing behaviors as it is brought on by nothing in particular.
How many times did I say "I love you" this year? How many beach days, jobs applied for, and bad dreams? How much laughter, wine, and blood spilled? How many songs learned, written, played? What is enough?