How does one stop being co-dependent on another person?

I have a male friend with whom I became too co-dependent because, although our friendship is platonic, I find him real attractive, and became too attached to him to the point of he got scared away from most communication. He's still my friend (and even tells me so), but is mostly steering clear. I want to be the person he knew in 2007. I was not co-dependent then. How can I get rid of being co-dependent, short of writing my feelings in my journal? (It's not like I woke up one day and said, "I'm going to be co-dependent.")