I wonder how you got tested. Do you have those results?
If you have hsv1, you can still get hsv2. Your hsv2 may be milder because you already have hsv2, but you are definitely able to get hsv2. Hsv2 is almost always a genital infection, so you would be very unlikely to get that orally if you perform oral sex.
Your partner would be very unlikely to get hsv1 after having hsv2. Hsv2 provides immunity to hsv1 in ways that hsv1 doesn't provide to hsv2.
Assuming your male, here are transmission stats for hsv2, from female to male:
Ghsv2 transmission, female to male, over the course of a year, assuming sex 2-3 times a week:
Only avoiding sex during an outbreak - 4-5%
Adding condoms OR daily suppression - 2-3%
Adding condoms AND daily suppression - 1-2%
You've already had herpes talks with two partners, and now a third, if I'm understanding this correctly. This shows you how prevalent it is. I don't know if you are thinking of not entering into this relationship because of herpes, but herpes isn't ever a reason to leave a good relationship, or stay in a bad one.
Generally speaking, you are safer with someone who knows they have it, and knows when to avoid sex, and may be on suppression, then with someone who has it and doesn't know.
Ultimately, it's your call, and you aren't a bad person for deciding you don't want to take the risk. If that's what you decide, all we ask is that you leave your partner with dignity, and don't be the person who shares her personal info with others.
If you have other questions, we're here. :)