I just spoke to the girl in question. She went to get tested this morning after me asking her to. She's negative! My test at 5.5 weeks was also negative. Can i trust that i'm ok?

i would say your ok, but for mental reasons take a final test at 13 weeks.

also, what type of test did she do?

She had a blood test and STD check. She has been with the same guy for a year now.

ur test is most likely conclusive.
for peace of mind u might wanna do 13 week test but its not necessary.
im surprised the results took that quickly. what type of lab was it

I'm a bit worried. Since the incident with the girl, i haven't had sex with my girlfriend as i've been so worried about passing something on. She did once try oral on me but fortunately i was totally dry, ie. no pre-*** , and it only lasted about a minute. She is extremely suspicious of me. I tested negative at 5.5 weeks and the girl in question also tested negative last week. She has been with the same guy for over a year. My girlriend is feeling run down and has a big ulcer in her mouth, she says she feels achy. I'm so worried that i might have passed something on to her but can't see how i could have. Does this sound like i should be worried?

u can test again if u like, but the results wont change.
did u go for std testing?
maybe talking about this with your girlfriend will help.
just some suggestions.
if you can wait 13 weeks and test for a conclusive negative result.

Thanks for the comments. Do you think that i and my girlfriend are OK? Should there be any more reason for concern do you think?

Also, in answer to your question, i didn't have an STD test. The nurse at the clinic asked me as to whether i had any symptoms, ie. discharge, pains, stinging sensation,etc., to which i answered 'no'. She prescribed me an antibiotic (i forget thename of it) but there was only one to take! It was massive too. The nurse assured me that, if i had chlamidia, then the tablet would clear it up. Does this sound right?