Today I have a co-worker who makes it quite obvious that he likes me. I was cleaning when we closed up for today and I found an origami heart. On the edge it had handwritten "A Secret Admirer". My co-worker came up and was saying it must have taken a lot of time to make it and stuff like that. It was his handwriting since I've seen him sign papers and forms. How do I tell him that I'm not interested because I have a boyfriend without feeling awkward afterward? I work with him everyday and don't want to ruin our friendship.