Razor risk

I used a friends razor 10-12 years ago before a night out and never thought of it again. The during covid my mental health declined and I started worrying that maybe I passed my friend hepatitis c and I need to tell them (I don't talk to them anymore)
I had the antibody test recently and it came back negative and my only risk factor was snorting cocaine on the very odd occasion (never bought it)
Even though I've had the negative test I can't help thinking I should tell them anyway to be safe, but obviously don't want to if there's nothing to worry about. I tell myself that theres much more chance that they could have got it themselves just by living their lives (sex, fighting, even dried infected blood on an object) than from someone who tested negative for antibodies and used their razor once.
Can someone help put my mind at rest?