Should I believe my wife's words, or my gut feeling when she smiles at her phone and says it's just a friend from Bumble?

I’ve been with my wife for 16 years, married for 6. We agreed on an open relationship with clear boundaries. Now she’s texting a guy she met on Bumble, says they’re “just friends,” but her body language and smile say otherwise. I feel like she’s lying, and it’s crushing me mentally.

Should I believe my wife's words, or my gut feeling when she smiles at her phone and says it's just a friend from Bumble?
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