Hmmm. This could be a false positive – I have seen false positives in this range before, though it is a pretty high index value. If you’ve never had symptoms and your partner of 12 years doesn’t have HSV 2, I think you should get a western blot to confirm.
It is terrible advice not to tell partners. Apparently, your doctor is unaware of asymptomatic viral shedding.
If you were my patient, I would suggest that your partner be tested first. If they are negative, get a western blot. If you are positive and your partner is negative, consider daily antiviral medicine to reduce the risk of infecting them. However, if you have not transmitted in 12 years, the transmission risk is low.