So about two weeks ago I went in for my annual exam and got a call saying I tested positive for chlamydia. I have tested negative for the last 5 years. So I told my partner and had him tested and treated. He got the results and everything was negative. I know 100% that I have been completely faithful, so how can I test positive and him negative. We have had unprotected sex from the time of my last exam until this last annual exam. How does this happen?? I am being accused of cheating since I tested positive, but I know for a FACT that I have not cheated or been unfaithful!! Please give me some answers as to how I can explain this to my partner. Thanks!