Chlamydia question

Patient: I have been with my husband for 7 years and had 2 children, I was std tested before I got with him and all clear. I have been having an affair for 6 months. 6 weeks ago my husband started getting burning when urinating, I made him get a test and he has tested positive for chlamydia. Myself and my other partner were then tested and provisionally treated for chlamydia. My results are not back yet but my other partners have come up all clear. Is it possible that my husband could have had chlamydia for the whole time we have been together but only now be showing symptoms? Or could my other partner have passed it on to me, and then my husband, without actually being infected himself?