The antibody result just tells you that you’re infected and it isn’t brand new. it doesn’t help sort out the timing of the acquisition.
Did you actually see the result to know it was an IgG test, not an IgM test?
If he’s not infected, it is not at all strange to not have antibody. I don’t know what your doctor was thinking there.
And you are certain that what you have HSV 2, not HSV 1? It was actually typed, correct?
The IgG test misses 8% of HSV 2, compared to the gold standard herpes western blot. So it possible that the test misses and infection in him. Is there any concern that he had recently had a new partner and had not yet had time to develop antibody?
Are you able to get tesdt results from your previous partner?