My boyfriend was just diagnosed with clamidia. We have been seeing each other sexually for 3 months. I tested negative for any std's including clamidia. He still blames me. I take docycline everyday for lupus. Is it even possible that I could have had clamidia and passed it on to him? Or could he have had it before me and never showed symptoms? How do I prove to him that I am clean is there a certificate or something?