How do I support my cousin who is in her 40s who thinks she has failed at life because she's never been married?

She likes this guy but he doesn't like her back and she keeps phoning him up saying she needs to walk away becuase he is dating other women. I think she is struggling with loneliness

How do I support my cousin who is in her 40s who thinks she has failed at life because she's never been married?
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