My partner was diagnosed with NGU a few weeks ago and he said that it is generally caused by Chlamydia. We have been together for 5 months and I have been monogamous since I started seeing him. He was angry and said I must have been with someone else because he had no STD's until now. He also said that the common time for symptoms of NGU to develop after transmission was 3-4 weeks.
Again, I have not been with anyone else since he and I became involved, but I did not get an STD test after the last person I dated, about 6 months ago. My question is, if neither my current partner nor I have slept with anyone else since we became involved, could I still have given him this STD as a result of my previous relationship? How long can a person have chlamydia before passing it on to their partner? Does one necessarily get NGU right after a person becomes infected with chlamydia?