It is safe for you to give him oral sex if you have genital HSV 2, yes. It wouldn’t matter if you were having an outbreak, no.
Do you have something good for him to read? I think that is always helpful when disclosing this information – sending him home with something to read and waiting long enough in the relationship that he has some emotional investment in you to balance out the fear of acquiring herpes. And it is always a good idea to suggest that he be tested as 80% of those infected with HSV 2 don’t know they have it. There is a free herpes handbook on this website that you can print out or refer him to for good and accurate reading about herpes.