Plz answer this question about my mentor?

This guy always smiles and winks at me, but doesn't to anyone else. The other day he held his hand out for me to put my hand on top of when we were walking down the stairs. Once we got to his office he told me that all his colleagues ask who "the gorgeous young woman is in court", referring to me. He also walks me out of the building everyday and opens my doors. Is he interested in me, or just being polite/friendly? If he's interested, how do I let him know I am interested as well while still being a lady?