Need advice (sorry it's so long)

Jessica
So my SO came home and wanted me to go through his phone to see if I could recover things he lost during the day because he believes it reset while in his pocket he had 4 txts in his inbox one being me another being his boss the third his dad and a 4th number I didn't know since he wasn't around to ask i clicked on it to see if I could tell who it was well it was an ex asking to borrow some money for her kid which didn't bother me much only slightly because he said he would give it to her if he had it when we are struggling a little at the moment but when he came back I asked him who it was and what he wanted me to do with it and he hurried up and deleted it and said he didn't know who it was now I'm upset just because he lied about it now I don't know what to do or if I should even say I know and am just looking for advice I'm 6 months pregnant and overly hormonal I just now don't know what else he would lie about any advice would be useful like I never go through his stuff I was only doing this to try to help and now I feel like shit like I did something wrong even though I was doing what was asked