Krittlekat,
at least you found out before you got married.
I found out my husband had it 9 months after we got married. We had unprotected sex for several years, as I was on birth control pills.
I was tested for hep c and luckily, I don't have it. If I had known about this beforehand, I most likely would not have gotten married to him.
I know that sounds mean, but it's the truth.
I am now afraid of sex even though we use protection. If I were you, I would always use protection just to be safe. Most experts say it is not transmitted through sex, but i've heard that it's possible too. So it's a matter of how much you want to be with him and if you can live with the fact he has hepatitis c.
Good luck to you and your boyfriend.
If you want to talk more feel free to pm me.