Possible cheating spouse advise?

Minnesota91
So my wife has been doing things that make me think she's cheating. I haven't caught her or anything, but I have seen her texting and "kiking" a guy we both work with. But when I've tried to see the texts or even straight out asked to see them she's already deleted them. Every time I've asked why she deletes them she says there's no space on her phone to keep the texts. But we have the same phone and I have every text she's sent me for the last year and a half still on it. So I suppose my main question is what's the next step. I've confronted her more than once and get the same-ish answer every time. I've even told her it bothers me that she deletes them and all I got was a "don't worry about it". Which clearly made things worse. So any advise is appreciated.
Updates
+1 y
Oh and there are a few other "signs" but I would prefer not to post them publicly.
Possible cheating spouse advise?
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