Dear vGirl,
At the very least, take your question to a Sexuality Expert Forum on Medhelp. You will find the advice you need there. This forum, here, is for questions about the relationship, not sexual questions per se.
And I agree, be very careful!
Sincerely,
Dr. P.
It is a big risk to take.
You can catch HBV through saliva containing DNA. This would be most likely if he had a cut in his mouth.
I can be caught through unprotected sex, even though 30% of cases in adults do not have an identifiable risk factor, meaning that they do not know how and where they got it.
The only advice I could leave you with is to be very very careful.
I would consult a doctor in person before any decisions are made.
Premarital sex is fine, but given the circumstances of you relationship, there is much more to think about.
If you are willing to risk catching HBV with this guy, just be sure that you are going to be with him for a long time.
Don't do it just because you have the big urge, which everyone gets.
You need to be thinking long term here, and I can't stress it enough, meet with a doctor.
They are there for these reasons.