OK OK OK OK
LETS NOT GET ALL CRAZY ON THE GIRL.
What she did was wrong and I can see it from your point of view
Now looking at it from hers, maybe she really does like you a lot and in the past she has gone out with players who have hurt and messed her about, so in other to be sure about you and given away her heart, she does a bit of detective work, and if you were telling the truth then she would know yes he is a keeper and if you were not, then she would know ok his a player.
Sometimes we human being cant help ourselves and because you didn't really want to talk about it, that got her curiosity going. I too have had my phone looked at and I have checked other peoples phone, but only the once to know for sure they are like.
Because everyone can talk the talk, oh your the only one I am seen and this and that but not everyone can walk the walk, follow true to what they have said. If you really like her, talk to her, let her know how upset you were and tell her without trust you two have nothing. SOMETIMES TRUST IS EARNED not given away remember that EVERYONE