Yes what Steve said. Snooping just exposes a bunch of confusing messages that you don't know how to interpret. Is it an affair? Or just two friends talking, or even coworkers talking? Who knows. And now that you told her you checked her phone you can bet she'll have that thing glued to her side now and will be even more diligent about covering her tracks. So in summary, you know nothing at all new and now she trusts you even less. Lose-lose. Don't snoop anymore.
Me: 58 w/ S16, D22, D25 Current R: 4 years Previous M: 21 years; BD: 06-14-12; S: 09-10-12; D final: 03-17-14; XW:56