Girl reached out to me (28f) accusing my fiance (30m) of cheating but the guy in the photos wasn’t him

Just for background: I’ve been with my fiancé for over 3 years and when I say this man couldn’t be more perfect I’m not exaggerating. He communicates amazing, we have always had a perfect relationship and everything about us is the best relationship of anyone i know. We always joke that we should start a podcast on healthy relationships because that’s how good we are together. Anyway….

A few days ago a got a message on Facebook from a girl claiming she’s been sleeping with my fiance for a month or so. He apparently told her she was in an open relationship but she had her suspicions it wasnt true so she’s reaching out to me. As proof she sent me pictures of his tinder profile and text messages… but here’s the wild thing. The guy in the pictures of his tinder profile and the phone number didn’t belong to my fiancé. Admittedly the guy in the pictures looked very very similar but it with 10000% confidence wasn’t him. Also the name in the profile isn’t my fiance’s name either.

I sent the girl pictures of my fiancé saying “this is my fiancé not that guy” and she’s swearing it’s him still. I asked her some of the times they’ve slept together and she gave me the 4 instances they’ve slept together. 3 of the 4 times I was either not around or working but I can say with 100% confidence that 1 of the 4 times I was with him that night and therefore it couldn’t have been him. I asked her more about that one time just to be sure and she insists she’s very certain it was that night.

Yesterday my fiance fell asleep early and I did something I’m not proud of and snooped through his phone. I found zero evidence of anything on his phone. No tinder. No apps on his phone that could draw suspicion. He definitely passed the test on every front.

So now I’m feeling extremely guilty that I snooped his phone and at the same time I’m still wondering if this girl was telling me the truth or if she’s just trying to start drama. Maybe it’s a guy that looks like my fiance and she’s just mistaken? Do you think I should talk to my fiancé about this and see what he has to say or should i try and find more details before approaching him? Do I tell him I went through his phone? What do I do?