Just been diagnosed

You can, but it's not as likely. I'm more curious as to why your doctor thinks it's a very recent infection, which tests you had done for herpes, and what the exact results were. The blood tests aren't perfect, but a positive swab is definitive, yet tells you nothing about recency of infection. People don't need to have any symptoms to carry or transmit herpes, by the way.

Although possible, if seems highly unlikely that AC gave you HSV2. First, you didn't have intercourse and it's not common for HSV2 to pass by oral sex. HSV1, yes, but rarely HSV2. Second, you would expect it to cause an outbreak on your vagina, where the virus first entered your skin (assuming a new infection). The bikini line is less likely, and your ankle certainly not.

So, assuming your culture tested positive specifically for HSV2, it would seem more likely that you either had it from before AC *or* got it from RR. The culture only tells you that you have an active infection, not how long ago you acquired it, although usually most first outbreaks do occur within 1-2 weeks. Did anything happen in the two weeks prior?

If not, then you're either one of the few who had a delayed first outbreak, or you had a first outbreak that was so mild or atypical that you failed to realise it was one. Even the doctor did not think this outbreak was herpes, so it's possible. If that's the case, you really can't know if it was from RR or from long ago, unless you do the IgG antibody test asap (within a month of this outbreak). If a high positive, you've had it for a while. If still negative or very low positive, it's recent.