It is possible that he may have antibodies only. Until he knows one way or the other, he should not drink alcohol. If his infection is confirmed, he should never drink alcohol again. The disease can be trandsmitted through sexual contact, particularly if he has had multiple partners, or either sexual partner has a sexually transmitted disease. Monogomous partners have a lower risk of transmission.
Men give it to women.
Condoms are advised. What you should know is the Hepatitis C is NOT a death sentence. Most people who test positive will die WITH it, not OF it. It moes slowly and there is time to get as much knowledge under your belt as possible and to weigh recommendations carefully. There is no cause for worry at this point.