Is there any other way to get chlamydia?

I was receontly diagnosed with chlamydia and it came out that my husband had had an affair.  I have never had sex (vaginal, oral, etc.) with anyone except my husband.  He was tested and we were both treated; a subsequent test showed I am now clear.  However, he just found out his original test was negative for chlamydia!  How is this possible?  He did have an unrelated infection about 6 weeks prior that was treated with cephalexin.  Could this have cleared him?  Is there a margin for error in the testing?  We are both confused and wanting answers.

[kdaily]

It is very possible that either of you had a false testing... He a false neg. or you a false positive.

Unfortunately you'll never know which it was. I think at this point what matters it that "IF" you did have it you no longer do.
I'm sorry for the unfortunate events your husband decided to take and I hope things get better for.