there are plenty of good fish in the sea
There are many other excellent or more suitable people, things, opportunities, or possibilities in the world that one may find. Said especially when one has recently been unlucky, unsuccessful, or has broken up with a romantic partner. I know you are broken up about Janet leaving you, but there are plenty of good fish in the sea. I'm pretty disappointed that I didn't get the job, but I'm trying to remind myself that there are plenty of good fish in the sea.
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