Ok GC'ers I have a question....tonight I'm going to happy hour with this guy I work with. When we first met, he used to flirt with me, but when I told him I had a bf, he stopped and hasn't since. We're friends, we talk at work, email, etc. Mr. ChiOJenn doens't know I'm going tonight, and I'm trying to decide if I should tell him. If I do, he'll get a little jealous( not scary, obsessive jealous or anything, but in a "I miss you, I'm 80 states away" jealous

). If I tell him, I'm going to have to put up with his mood, and do my broken record act: "we're just friend, he knows I have a bf, etc." Brian-mybf-says that guys don't care if a girl has a bf. But if I don't tell, I would feel like I'm hiding something-which I'm not, and I wouldn't want this to come up later in a "what? you hang out with him? you never told me!" sort of way. Because I plan on hanging out with this guy in the future, and don't want to keep anything from Brian.
So ladies, what would you do? And guys, if this was your girlfriend and she told you, would you be mad? What if she didn't tell?
Thanks for the advice ya'll.