Get the hell out. Kick her to the curb.
You have violated her privacy, and she has violated rules of monogamy. You are calling technicalities on cheating. You aren't blowing this out of proportion... next time, she'll be blowing another dude.
That is ok, because she didn't mean to, right? Or "didn't want to?"
"I cheated on you,but I didn't want to?" Does this seem illogical to anyone else here?
I personally don't give a shit about privacy. The right to privacy is waived when you are hiding something major from a significant other. You know, something that would DIRECTLY AFFECT THE RELATIONSHIP.
This sounds like a dead end relationship to me, sorry.