I have a big crush on a guy I work with. For various reasons, the chief one being that he's married, nothing is going to happen between us, so I've been trying to deal with it by being polite but distant, not speaking to him about anything other than work, avoiding being around him if I can, and so on. The trouble is, he's not letting me disengage. He's always chatting away to me about what he's got up to at the weekend, films and tv, music - and asking me about myself in return. I try to give the briefest answers I can without being rude but he doesn't seem to pick up on it. He's friendly and open like this with pretty much everyone, so I don't take it to mean anything, but I can't get on with the business of getting over him when he's being nice to me! It really doesn't help that he regularly tells me about his wife, who frankly I don't want to hear about.
Any advice for politely getting him to give me some space? I should add that he's in a position of seniority over me and I do have to work with him, so I definitely have to tread carefully. Feeling this way is making me really miserable and It's taking a lot of effort to not to let it affect my work.