What can I do to ignore this situation?

Much younger guy had a crush on me, I talked to him and everyone in his place of business. I am a client. Yes I'm friendly but married,don't know a stranger, guess the youngster thought I had other intentions. Since then he got a girlfriend, and goes out of his way to speak about her to me. Why bother doing that? Now he's making comments like oh your just lonely, your just unhappy, etc. i am so sick of his sh!t. If I'm friendly I turn into a lonely slut. Ever since he came to this place my life has been crazy, heard he told everyone he wanted to be with me and had them ask me a million personal questions. I have to be at this place three times a week and he is unavoidable, so what can i do to keep my head up high. Do I keep the friendly side or do I turn into the ***** that I'm not. Thanks