3 months ago I got chlamydia from a new female partner who I am still with. She showed no symptoms and had no idea until I started showing signs about 2 months after we started having unprotected sex. My symptoms were penile discharge and a slight burning/itching sensation.

We were both treated at an urgent care with Zithromax (1 dose) and a shot in the butt for gonorrhea (recommended by the doc to be safe) and after about 2 weeks everything was completely healed for me.

We followed strict condom use for 4 months, meanwhile she was tested for chlamydia again and came out negative. I was not tested as I didn't show any signs which were very acute before.

We deemed it safe to have unprotected sex again and 2 weeks later I am now showing signs just like I did before. I was fine for the last 4 months of protected sex, does this mean that my parter was falsely deemed negative when she in fact was still infected? Monogamy is not a question for me. What gives?