If you tested negative for HSV 1, the chances are a little higher that it is a true positive.
If you are testing in the low positive range because it is new infection, then it is likely from her. If you got it 3.5 months ago, one might expect a higher value. Yes, I believe she should be tested now to see her status. If she is negative now, you certainly did not get it from her. If you continue to have sex with her, then her value will always be a moving target, so there is no reason not to test now. I agree that it is unlikely but not impossible that you acquired HSV 2 from the partner 3.5 months ago.
I would not say that the transmission rate is extremely low without an outbreak unfortunately. Our research indicates that most transmission occurs when no symptoms are present.
How are you getting the western blot testing done?
Terri