Cheating SO? Or salty bitch?

So I'm writing this to get some insight from another prospective. I know being in this relationship I see things differently from people outside of my relationship so I'm curious to see what you ladies think of it. Does it seem like this female is just saying crazy things to upset me? (Bc let's be honest, some females can be petty) or do you think she's being very bold and truthful?

This is a female coworker(a higher up) of my fiance. Recently I have found out they have been communicating via text and calls far too often for my liking. How I found this out? No, I was not snooping. Him and I have a shared cell phone plan that is in my name. I was receiving texts from our carrier basically saying our minutes are running low for the month (in the middle of the month) asking if I want to upgrade the plan ...being this is unusual, I decided to see where all the minutes were going. And so yea.

I asked him about it and told him I wasn't comfortable with it and wanted answers. Well, he couldn't show me any texts from them as he deleted them all from his phone. His excuse (he didn't want to upset me if I seen how much they'd been communicating but claims it was all work related convos) so if it was work related, how could I possibly be angry about that? Now you look guilty.

So he calls her up and asked if she would send me their convos. Takes her some time but then eventually sends a screenshot of a few texts( to me, it seemed more friendly/flirty than professional but work related) and not nearly as much as they'd been texting. Like where's the rest of them?

I guess at that point she was upset bc I was questioning their relationship/friendship and felt the need to talk shit on me to him via texts. (Me- why does this coworker feel so comfortable talking shit to you about me?) That's crazy..

Here's a screenshot of what she texted him (in blue) and then what she texted me (In purple) .. please do not judge my relationship ,we all deal with it differently and have our opinions. I just want an outsiders opinion about the texts she said to us both. Do you think it was out of anger or truthful? That's all , thanks.