Why is my wife flirting with a coworker? What should I do?

We’ve been married for 5 years, but recently, I’ve noticed my wife acting distant and protective of her phone. I found messages showing she’s been flirting with her coworker, but she insists nothing physical happened. She says it’s part of a midlife crisis, but I’m struggling to trust her. She even logged off all her accounts on my PC. How do I get closure and move forward from this?

Why is my wife flirting with a coworker? What should I do?
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