First, let me ask a few questions about his diagnosis:
Can you obtain the numeric values of the test results for his herpes antibody tests? There is sometimes a chance of a false positive with certain test results I can help you sort out whether this is something that should be clarified.
If he has HSV 2, he will likely never acquire HSV 1. Or it is also possible that the screening test missed his HSV 1 infection. The frequently used screening test misses 1-2 out of 10 infections for HSV 1. But getting back to your question, for some reason HSV 2 infection protects against HSV 1 new infection but the reverse is not true. If he is really infected with HSV 2 genitally, then you are vulnerable to his infection.l If you give him oral sex, you could acquire his HSV 2 infection (though not common) and certainly if you have intercourse with him, you could acquire his HSV 2 infection genitally.
In order words, he is safe from your herpes but you are vulnerable to his. The best strategy would be for him to take daily antiviral therapy and use condoms when having sex with you and clarify that he does not need a confirmatory test for his HSV 2 antibody test results.
You have two more questions to ask me, feel free.