He's not exactly demanding sexual favors, but his flirting is getting really gross. What's a girl who likes her job to do? You will need diplomacy and documentation. Assess his behavior. Now, don't be offended, but we have to ask: Is he really coming on to you, or is he just a sociable, flirtatious kind of guy? If it's the latter, just ignore it. Do your part to keep the relationship professional. Don't chat about how your last two boyfriends cheated on you and then expect him to know that...