Hey, welcome to Fluther. How old are both of you? It’ll help people to understand this situation if we know if you two are 16 and at your first job, or adults and well into your lives and careers. For instance, do you know if he is married? This sounds unlikely if he told other people at work about this situation, but it’s still possible. It’s worth considering that he might be shy. I imagine that a lot of straight guys get sick of the expectation that they are supposed to initiate everything and pursue women by default. Or he might just think that he’s having a bit of fun with you when the opportunity arises, and has no interest in taking things further, as you seem to. Maybe you can ask him out for coffee or lunch and just ask him straight up what’s going on.