If you've been tested & it came up negative, no. Don't worry. Hep.C can--rather rarely--be transmitted sexually, but usually it's associated with using dirty needles.

Hello. I found some useful information on hep c for you. It can be transferred thru sexual intercourse, though they say on the webpage that it is not easily spread this way. Also, sharing needles, toothbrushes, razors, nail clippers, and such.
It is as helden said transferred most commonly through using dirty needles, or sharing needles.

At this point, I should think you have nothing to worry about, as your relationship with this person ended 10 years ago, and you were tested within the last year.

Here's the webpage, so that you can read up on it if you want.

Http://www.All-about-hepatitisc.Com

if you are still concerned, go and get another test! That should put your mind at ease.

I wish you the best.

~qriosity~