So it seems that my girlfriend has been receiving letters from an ex of hers in prison, these letters are of a extremely sexual nature. I have read one of these letters and found that she had visited him sometime ago, but I'm not sure whether it was while we were together or not, furthermore I know that from the letters she is sent him pictures and they speak on the phone. I know it was a breach of privacy reading these letters of hers, but after reading them I am completely floored and Confused as to what to do. Any advice would help on what to do.