Tricky situation, don't know if I should tell her

Last week my girlfriend let me borrow her phone to go on the internet. I was curious and looked at her texts. I saw a text from a certain person that concerned me. It was a single text (no history), but the content indicated that it was part of a longer conversation. Which certainly means my gf was deleting texts from this person. Surely enough, a few hours later, I looked at her phone again and that text was also gone. A week later she mentions she deleted all her texts by mistake. Which most likely means she was trying to delete something, but deleted everything by mistake. This deleting happened on the day we were going to see each other, probably because she didn't want me to see something. Then I caught her texting someone on her cellphone. She said it was her sister. Later that night I looked at her phone. No texts from her sister. I looked through her history and noticed that the person of interest had called her at 2am on one occasion. And she called him other times. I don't know if I should confront her about this. She has broken my trust in the past because of things with her ex. She begged me to take her back so I did (because the sex was good, I have no feelings for her). Do I have reasonable suspicion to confront her about it? I know what I did was bad and I am prepared to apologize and deal with the consequences. But the end justifies the means, especially since she has done it before.

Put the internet to work for you. via Personal Recipe 2629984