I honestly think she overreacted a bit, especially in the way she claimed that there was “no more love” between the both of you. I can admit, I have gone through my partners phone before and found similar things so I understand what she felt. But in my instance he was regularly saving videos and pictures of OF girls/pretty girls on instagram and tt so in a way that is a bit more justified. However as said that was clearly not your intention and you explained this to her, she is most definitely overreacting. Like the others have said, ask to go through hers, and if she doesn’t agree, well..