My ex-boyfriend says

I was tested on August 3rd for Chlamydia and my test result came back as negative.  Now my boyfriend at the time is claiming he has tested positive and swears he got it from me.  I haven't been with him since August 29th and show no symptoms...17 days
Is it possible he got it from me even tho I tested negative... before him I have been with the same person for 9 years?
Should I be re-tested? It is expensive and I don't want to waste money.  
Or is it more likely he got it elsewhere?

[2terrified]

I would because you were with him since testing last.  It isn't unusual for a woman to not show symptoms.  It happens to about 75%.  Why don't you look up free std testing in your location?  Then you could get the testing you need and not worry about wasting money because if you test positive, they will help you with treatment.