
There are plenty more fish in the sea
Emotional Comfort
 Used to console someone feeling rejection or heartbreak, suggesting optimism for future relationships. 
She felt devastated after the breakup, but her friends reassured her that there are plenty more fish in the sea.
 Non-literal Fish
 The phrase refers to people, not actual fish. Understand it as a metaphor for romantic possibilities. 
Even though he was her first boyfriend, she knew that there are plenty more fish in the sea.
 Positive Attitude
 Encourages a positive outlook on finding someone new and implies many potential matches. 
His sister told him not to mope around; after all, there are plenty more fish in the sea.