In June 2008 I was tested for STD's and all results came back negative. I have been having sex with the same man from March 2008 to the present. This past week I was hospitalized for PID which was caused by chlamydia. My boyfriend swears he has been faithful, but my doctors says this is unlikely, and he must be lying. I am torn, I know that I have been faithful, and I believe in my heart my boyfriend would not cheat on me and then lie to me. Is it possible he had this before he met me and only transmitted it to me now, even with my negative results in June? Could I have received a "false negative"? Please help.