What do you ladies think?

Lately my gf has been acting weird. We had a fight over access to each other’s phones because I once discovered a guy on her phone under one letter and conversion muted where he said how he felt towards her, I don’t usually check her things but I found this odd and before I could finish reading what she replied she came in took the phone away told me she was leaving me and deleted the conversation on her phone. Although it was still on her Mac so I told her to show me there she refused at first but then told me to sit down and that she was going to screen shot the convo and send it to me. But I knew she was deleting things and in the end said the convo did not save complete so she just deleted it. Well now she likes to have access to my phone but when I ask for hers she doesn’t want to at all. Says I’m insecure, but I trust her completely. She’s on her phone a lot when were together and she always seems to be typing but when I try to look she quickly hides it or I found thag notifications on her phone “do not show up for some reason”. What do y’all think? Time to go and move on? Any type of confrontation or questions regarding such things with her she gets upset and blames me for having trust issues and I get blamed as the bad guy meaning I can never get any answers.