Yes, taking the acyclovir can cause a false negative on the HSV 2 test. If you want to know if these lesions that you describe are caused by herpes, you’ll need to stop. If you then get a lesion, have a PCR swab taken immediately to see if this is herpes or not. I think the chance that you acquired this orally the first time you gave him oral sex is low but possible. I’m assuming no condoms were used for oral sex. May I ask why he is not taking daily antiviral therapy to reduce the risk of infecting you? That would reduce your risk of infection by almost half. If you did contract it orally and not genitally, the oral infection will likely protect you against genital infection, yes.
And you are most welcome. You have one post left if you have other questions
Terri