How do I convince my cheating wife to come clean?

I first began noticing that my wife had become more distant over the past 12 months.She's been very stressed at work and school so I thought it was a product of that.So I thought nothing of it.Then the stopped about 3 months ago.Again, thinking nothing of it.I tried talking to her about it but all I got was closed ended answers and responses.I lathered on the emotion, bought her flowers, and pretty much let her go out with her friends all the time hoping that it would alleviate the stress on her.Then about a month or 2 ago whenever we kissed, it would be a peck and then she would pull away. Again thinking not much of it. Then last night, she went into the bathroom to take a shower and I heard the shutter sound of her cellphone go off twice. I started to get curious, why would she be taking pics of herself in the bath?Then when she fell asleep I hacked her cellphone and found pics and text messages with proof of her cheating.How do i get her to come clean w/o looking like an ***?SOS