You cannot get HSV 2 from HSV 1 or the reverse. These viruses are their own entities = they don’t change into anything else.
So he clearly has HSV 1 with that index value. He is still vulnerable to your HSV 2. What was your index value on that, by the way?
If he gives your oral sex, you likely will never get his HSV 1 but he could get your HSV 2 orally, but not likely, particularly with you on antiviral therapy.
Terri