Hi,
Not an easy question.  On one hand he could be "The one and only" and you shouldn't lose that opportunity.  On the other hand it has the implications you mentioned.  If you really think he might be the one for you have a short discussion with him: Tell him that you don't want to mix private affairs with work..... and hint him that privately you can get on...... but at work you should remain "total strangers"..... I don't mean you'll have to hide your relations !.....  you simply separate your private life from work....
Best regards,