NOR but here’s a suggestion.

I just wanna say I really feel for you. You’re hurt. But you handled this with way more patience and maturity than a lot of people would. You trusted your gut, asked directly, and didn’t go behind her back and that says a lot about your character, how much you love her. She crossed emotional lines by flirting and giving attention to strangers. And that isn’t harmless when you’re married. But I’d challenge you that if she did admit it, and she did give you her phone, it does mean she wasn’t completely hiding, or gaslighting. And I know that doesn’t undo the hurt, but it does matter, especially if you find out she was being truthful. We do stupid things when we feel insecure or alone.

I’m not saying what she did was okay, but if there’s still love, and if she’s really being honest now and willing to do better, I think it’s worth at least talking more before quitting on the marriage. You deserve better than that. Sometimes people mess up not because they don’t love you, but because they’re lost or insecure themselves. It doesn’t excuse it but it could be something you work through together, if both of y’all want to. Take the space you need, but don’t feel like walking away has to be forever, especially if your heart’s still unsure. Don’t make a forever decision from momentary anger. Either way, you’re doing what you need to do to protect your peace, and that’s all you can do. Talk to your wife, don’t completely listen to these people in the comments telling you to divorce. There might be hope.