http://www.medhelp.org/user_journals/show/8280/how-should-I-treat-my-genital-herpes is a prior journal post I made that I think you've find very helpful with your decision of how to treat your herpes.
how were you diagnosed as having hsv2?
has your gf been tested yet to know her own status?
if you and your gf did nothing but avoid sex anytime you had anything going on genitally, she'd be 90-92% likely each year NOT to contract hsv2 from you. if you throw in condom use and daily suppressive therapy too, then her risk decreases and she's 97-98% likely each year NOT to contract hsv2 from you.
do ob's decrease over time? well not really for most folks. One study showed that after 5 years of being infected with hsv2, 25% of folks had more ob's, 25% had less ob's and all the rest had about the same number. The most important thing to remember is the number of recurrences you have is meaningless when it comes to transmission. You should the virus about the same amount whether you have 0 ob's a year or 10 ob's a year so if you have a partner you are trying to protect, daily suppressive therapy significantly reduces their risk.
grace