Don't confront him directly, do that indirectly so as to preserve your respect as a lady on his side.

Start off by introducing yourself as a friend to him first and try not to disclose your affection towards him through words but through actions.

Play some little games with his mind like associating and having fun with other guys and not him whenever he's around to see if he'll be jealous.

If he's jealous, he might also be interested in you but if he ain't, then try...