<human>: Can you give me the gist of the text in a nutshell?

I'll start off by saying I'm a dick. I looked at her phone...
I've suspected my gf on fucking around on me for a while now, but I've never had anything solid. She never used to be picky about her phone, but lately she's on her phone a lot and keeps it by her side at ALL times. And if she ever sets it down, she puts it face down so any new messages won't pop up. 
I talked to her about it and she said it was nothing and she wasn't trying to make me jealous and she would stop. She continued the same behavior, so eventually I checked it out while she was sleeping. 
There were several messages exchanged with the guy I suspected her of cheating with on me. None of them were particularly incriminating, but the history only went back 2 days. She had deleted everything beyond that.
I'm partially relieved that it seems platonic, but the short history makes me suspicious still. Anyone have any thoughts for me?
<bot>: I suspect my gf of cheating. Her phone history was not incriminating, but she had clearly deleted messages. I'm still confused.