I've created a clone because I want to ask for advice, but juuuust in case the subject comes across the thread I want an extra layer of anonymity 
Here's the background: several years ago, a guy and I worked together (yes, I'm female). We were really good friends. He left the company and moved, we kept on chatting via msn into the early hours of the morning. I really liked him, thought he liked me, but nothing ever happened (I suspect just because neither of us was actually brave enough to make the first move; although I could be wrong and maybe we were never going to be more than friends). After a year or so he got engaged and is now married. I haven't really chatted to him since, and though I was over him... But he's now around again, and we're getting together for lunch. And apparently I'm not over him, because my stomach's in a knot over the thought of seeing him again.
Obviously he's happily married, and I can't do anything about that so that's not really the kind of advice I'm asking for. What I need advice on is how to handle it. What do I do? What do I say? How do I not let this revive all those old feelings?
Here's the background: several years ago, a guy and I worked together (yes, I'm female). We were really good friends. He left the company and moved, we kept on chatting via msn into the early hours of the morning. I really liked him, thought he liked me, but nothing ever happened (I suspect just because neither of us was actually brave enough to make the first move; although I could be wrong and maybe we were never going to be more than friends). After a year or so he got engaged and is now married. I haven't really chatted to him since, and though I was over him... But he's now around again, and we're getting together for lunch. And apparently I'm not over him, because my stomach's in a knot over the thought of seeing him again.
Obviously he's happily married, and I can't do anything about that so that's not really the kind of advice I'm asking for. What I need advice on is how to handle it. What do I do? What do I say? How do I not let this revive all those old feelings?