The most important thing is to educate yourself on the illness. And you have come to the right place. Read as much as you can, and ask questions when you don't understand. There is a very good detailed UK site on the subject. It's called www.hepctrust.org.uk
All the best, Marcia
You're not alone in not being able to figure out how you got the virus --- many people who have Hep C can't either.
As far as sexual transmission, it is very rare for Hep C to be sexually transmitted. It's a bloodborne disease, so unless you both have open wounds while actively engaging in sex, the risk of transmission is small. My husband (who probably has had HCV for about 40 years) and I have had unprotected sex since 1986, and I am still Hep C negative. I hope that helps to alleviate your worries. I am glad to hear that your boyfriend is supportive.
Some people who are exposed to Hep C develop chronic infection, but some people rid the disease spontaneously, on their own. If your 5/29 blood testing included a Viral Load test (often called a RIBA or PCR) that should tell you for sure where you stand. If your RIBA/PCR test shows undetectable virus, you should rest easy. If your Viral Load test shows >50 IU/ml, it would mean that there is detectable virus in your blood, and I hope that is not the case. If there is, you might want to return to this forum for more information and support.
Best of luck to you.
eureka