While I was driving, my girlfriend was using my phone to call her mom (her phone was dead). My girlfriend was using the gps to get to our destination while talking to her mom on speaker, I look over at my phone to see the next direction and low and behold I see her going through my messages! When I looked over she was scrolling through a conversation and quickly turned the phone away. She said, "I got stuck in your messages and couldn't get back to the gps, it just randomly went to your messages screen." I made it clear I didn't believe her, she has an iPhone too and knows how they work… We only talked a little bit about this incident and I had nothing to hide on my phone anyways, but where should I go from here? I don't think there's any validity to her "doesn't know how my phone works" story.