Finally I got myself enough courage to tell the guy I like what I feel about him and asked him if he is willing to take me out, he turned me down by politely and indicated that he's already got girlfriend. I was sad by that time, later I think of the day we went out with other colleagues to dinner, he asked how I think of him seriously, I didn't answer him cause the conversation was interrupted by the man sitting beside. Maybe I just don't know anything about men。