This message should have been in the STD Forum. But this question was posted twice (you probably hit Return an extra time) perhaps incurring a 2nd charge on your credit, and I don't want you to do a third one.
1) Ten years after diagnosis, you might have asymptomatic shedding pretty infrequently, even without antviral therapy. On Valtrex and with no symptomatic breakthrough episodes, most likely the risk of transmission is very low, even without condoms. Nobody can guarantee that, and there are no definitive data to give you a numerical estimate of the risk. But the risk averages 3-5% per year (with sex an average of 2-3 times a week) even on no treatment. With treatment, and given the duration of your infection, most likely there is less than 1% chance per year.
2) I'm not a condom expert. But a lot of people like the newer polyurethane condoms, which are said to retain a lot more sensitivity than latex.
3) My advice to both you and your partner: First and most important, your partner needs a blood test for HSV-2. There is a good chance he already is infected, since 25% of the population has it (even without symptoms). If so, you need take no precautions at all; he cannot be reinfected with the same HSV type. But if he is negative for HSV-2, then....
Second, herpes simply is not a serious enough health problem to stand in the way of a promising relationship. The risk of transmission seems to be low, but even if it occurs, you might never know it (most cases are asymptomatic); and if you get symptoms, effective treatment is available. The big deal about herpes is the risk of transmission to others. So if you guys aren't certain about your future together, i.e. your partner might have other partners someday, then you should take reasonable steps to reduce the transmission risk. But it seems to me you already are doing that. Even if condoms don't work out, the odds are you won't catch it anyway.
I hope this helps. Good luck to both of you. HHH, MD