Advice

A couple years ago I found out that someone stuck a note in my coworkers locker that said I was in love with him. I found out today that he thinks that I am the one that wrote it and I kind of feel bad because I know how uncomfortable it made him. We don't talk much, but I want him to know I didn't and never would do that. Does anyone have any advice on how I should handle this?

UPDATE

I also found out that he told many other co workers about this and recently brought it up again so now I am going to feel uncomfortable going to work around these people when now I know that they heard a lie that I put the note there.