There are conditions that look like herpes. You could have a bacterial infection. Next outbreak you need to get them looked at. I know you're out of country but see what you can do
My outbreaks are blisters or blister clusters. I get them on my groin, shaft, and testes, although they are almost never in the same spot. Bad ones will heal with a yellow crust on the skin. I'll have an outbreak for a week, be maybe 2 to 7 days outbreak free, then have another outbreak in a different spot.
Just before having my initial outbreak I shaved my pubs with a oldish razer that had been in the shower for a while, and had a couple niks and cuts from shaving. Initially I thought it was from that, but the symptoms are so spot on to herpes that its hard to say it might be something else. Is there some kind of infection from shaving that, if untreated, has symptoms identical to herpes?
It's hard to say for sure what you have going on. Describe the outbreaks.
As far as her testing negative. First, she may indeed be negative and this isn't hsv. It takes weeks to months to build antibodies so maybe her infection is recent and she hasn't built the antibodies. Another posibility although small, she may not make antibodies. Almost 10% of people may never make the antibodies.
Meds are the only thing proven to work.