If you've only had vaginal intercourse with your fiancee, then she has to be your source. If you've only had handjobs and breast to penis contact with the others, then you can't have gotten hsv2 from them. She could have gotten it from penis to vagina contact, depending on the amount of contact they had.
In any case, she needs to test. You'll know more then.
If she doesn't have it, there is a chance you could infect her, but let's address that when we find out if she's already positive.