False possitives can occur with bacterial antigens, allergic antigens, other viruses.
Also, against herpes, your body does not sustain antibodies, for if you could, herpes would stay dormant for years and decades.
So, those levels will fall, but should not usually fall to the point of undetectable. The Western Blot method is older and not as reliable and can have more false negatives than antigen specific antibody tests.
The good news is that cross reactivity is not common, is an exception, but statistacally significant enough to warrant three or four tests over a period of one year.
Three tests are strong indicators four will show a pattern that you can sink your teeth into.