I cannot understand why my wife talks bad about me to her friends?

We have been married for 4 years, I think she has run out of love for me, even my breathing hurts her. And one day I heard her badmouthing me on the phone, when I looked at her last call I saw that she had a close male friend. I was very upset that she was gossiping about me with someone else. Should I ask this openly or should I catch her red-handed?

I cannot understand why my wife talks bad about me to her friends?
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