Yes, I had one of these work flirting kind of relationships. After months of wondering whether she was just joking, playing around with me or we were both just messing about, there was the work's Christmas party. A bit of alcohol cleared that situation up for both of us. DHUTWU.
On the subject of ex girlfriends getting into contact this also happened to be a year or so back.
After nearly 10 years of no contact she turned up on my doorstep asklng me how I was (how she got my address I still don't know) Now when I went out with this lady I was probably 19 and she was nearly 30, she dumped me and being a young kid I was absolutey devastated. Now 10 years later, me being in my prime (if I do say so myself) and her being well past her prime... it was quite easy to turn that one down. I was too kind rejecting her looking back, I should have gave her a proper piece of my mind...because this lady pretty much took all my naivety and her experience and did a number on me.