So if the blisters on her were actually herpes, it is likely new infection. Waiting three days after symptoms appear and having a culture done (PCR is far more sensitive) may be the reason the swab test was negative. She may have herpes now and an IgG test is a few months will be positive (if she has herpes now). If she does not have herpes, there is nothing she can take as a preventive, only you should take drug for prevention of transmission. The lack of outbreaks is not a reason for you to be on suppression, you will still shed virus albeit less frequently. If you are only going to take suppression with sexual encounters, you should start 5 days before the encounter, either 500 mg of Valtrex daily or 400 mg of acyclovir twice daily. That medicine will not, at this point, impact your score
Your outbreaks may well come in the same place but they may also show up anywhere in the boxer shorts area.
As far as we know, there are no long term implications for your health for having HSV 2.