<human>: Backstory: We are getting married soon.  I am 27M she is 22F.  We have been dating for 3.5 years, engaged for 1. Recently, my fiance's old best friend, well call her Stacy(22F), messaged her and said she was upset with her because Stacy recently found out a few months into dating me, my fiance was flirting and cheated with a guy we both know, well call him Frank(23M), and she couldn't believe my fiance would do that and she needs to confess that to me before we get married.

My fiance called me up, told me this is what Stacy said, and started crying saying she would never ever do that, and can't believe Frank who works together and is close with Stacy would make something like that up.  I believed her.

Recently, my curiosity got the best of me and with the wedding being so close I figured I would just make sure I check everything out so down the road I don't regret anything.  Knowing my fiance's facebook login, I checked her messages from this time, about 3 years ago, and found conversations of her and Frank flirting, calling each other husband and wife, and at one point her saying she is mad at him, he better make it up to her, and to get creative.

Now I don't know who to believe, my fiance or the story Frank told Stacy.  I would assume that if something did actually happen, my fiance wouldn't tell me that Stacy accused her of this, unless she was covering her bases.  I also don't know how to bring this up because I only am doubting my fiance by reading her facebook messages.  

This was 3 years ago, and they stopped talking since I moved back home shortly after (had a long distance relationship), so if it was a thing, it definitely did end, but it still makes me question trusting her.  She would always ask if I was ok with her going to hang out with Frank, and I said it was always fine because I assumed if she was going to do something she would do it anyways.  Frank also has a history of depression and mental health problems, so him lying to Stacy is not out of the question.

Provide a brief overview of the text.
<bot>: 3 years ago fiance (gf at the time) may have cheated on me, found flirting messages in her facebook inbox from that time, not sure how to bring it up.