Dear Amy: I get along with a male co-worker fairly well, and we go out to lunch at least twice a week. I have never thought anything of it past a mutual work relationship. He's 12 years older than I am. I am married, and he has been with his significant other for almost nine years.
There is a fast-food spot we go to often that we both love. The girls who work there know us and are quite friendly.
The other day I went there by myself and one of the girls asked where my "boyfriend" was.
I made it clear to her that he is just a co-worker, and she told me that he refers to me as his "girlfriend." She said that since he always pays, she...