Why is he always saying she is anxious?

My friend's partner is always telling her she is anxious or worrying. I don't find her like that at all, nor does anybody else. Whenever she trys to talk to him, he tells her to stop going on, or stop worrying. She is a very fun person, but I think she is losing that as she is now unsure about what she can or can't say in case he perceives it as her worrying (even if she isn't). Why would he be like that with her. She said he has a female friend, who moaned on for ages about a problem she was having, and he didn't take that as worry, that was fine. But not so with my friend. What is wrong with him that he doesn't see her fun side and only wrongly thinks she is a worrier !

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No she doesn't have anything like that at all.
Why is he always saying she is anxious?
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