misery loves company

(proverb) people who are sad like to be with others who are also sad

A: My boyfriend just broke up with me!
B: Mine did, too!
A: I feel so alone!
B: Let’s rent a movie and watch it together. Misery loves company, after all!

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Similar idioms:

1. feel like a million dollars
2. break down
3. laughter is the best medicine
4. the straw that broke the camel’s back