well then, i saw my doctor and he made the point that from the urine sample id given them the first time i complained of a uti (in december), there was no "growth", no bacteria was found, but a lot of blood.

this made me pretty confused, because id read about utis quite a bit after that first time, i fit the description totally, i had nearly every single symptom and considering the circumstances it was quite likely for me to have a uti.

so the doctor asked me if there was any chance of an STD, considering chlamydia's symptoms are very similiar to urinary tract infections, and i said no. ive never had unprotected sex, and ive been with my current partner for two years. im the only person hes ever slept with and i know hes clean because hes been tested. so naturally, now im freaking out about maybe having chlamydia and driving myself crazy.

how likely is this? could my prior urine sample have been faulty? is there anything else it could be?

Chlamydia is a tricky and sneaky infection. Condoms are some protection but no guarantee. (By the way, that's true about all STDs... protection is important but is not a 100% assurance.)
Chlamydia is one of those rare infections that you actually CAN contract without sexual contact, because it can survive several hours in any warm, humid environment... One group of 6 women (yes, I was among them)all turned up with it following a three day wake, during which we shared towels, wash cloths, etc...I know I had not been otherwise exposed in the months between my last screening and the wake and I somehow doubt that my 70 something widowed great aunt was having it off in the closet...the only common factor was the shower...
It is extraordinarily transmissible and can be dormant/show no symptoms for years, as can a few other types of infection. Get tested for the full STD panel and ask for another urine dip, just in case the first was faulty.

my results came in today and, once again, no bacterial growth but apparently my "white blood cell count has elevated".

what the hell does that mean? i thought WBC = presence of infection, but no actual bacteria was found??

Pyuria, the presence of white blood cells in urine, can indicate inflammation anywhere along the urinary tract. It is also symptomatic of a urinary tract infection even when bacteria is not seen.