When I bring up the issue she starts the argument with me that 'Im invading her privacy' and that 'I am a nut' because I check the cell log. She has been deleting her texts messages to him.
She's raging and dissociating because it's triggering feelings of embarrassment, shame and guilt with her actions. This sounds very close to an emotional affair. It's hard to try to reason to that this is wrong in a marriage and she's dissociating ( lying ) and altering reality. I'm sorry.
What are your boundaries with emotional affairs? What's the climate like around the house?