What is the meaning or origin of the "plenty of fish in the sea" meme?

The phrase "plenty of fish in the sea" is a well-known idiom that suggests there are many potential partners available for someone looking for love. The saying is often used to console someone who has gone through a breakup or is having difficulty finding a romantic partner, implying they shouldn't worry because there are many other opportunities out there. Its origin can be traced back to the 17th century and has since permeated various aspects of popular culture. In modern contexts, it may also refer to the abundance of choices in other areas of life, but it remains most commonly associated with the advice given to those navigating the dating world. With the rise of internet culture, the phrase has been co-opted into memes—visual or textual jokes shared widely online—either to humorously comfort someone or as a lighthearted reminder of the vast number of potential relationships that are possible.