Is it wrong to look at another person

I have a partner that I would never hurt so I have a question. There is a guy works in the produce section of a local grocery store. I go in there when I know he is in and purchase fruit items. I always look at him and speak to him. He is very attractive, neat, clean looking and about my age. I have known my partner for going on 6 years been living together for about half that time, and would never do anything to hurt him. The produce guy is the first person I have ever looked at as someone I would like to be with. I have never said a word to my partner about him and have no intention of doing so. Is it wrong for me to feel this way?