Ever checked your partner's phone? If so what did you find?

I have a high self pity story about this that I absolutely hate. One, I don't know why I checked the phone but once I did, I found her conversation with a guy where she is discussing about how she can choose to keep me on a hook, take advantage of me as I don't have any other options. That whole conversation was such a trauma for me that although it has been 6 months since I read it, I still get furious and frustrated every time I think of it.