Heres the thing:
I have started to notice (I think) some changes in the way he behaves towards me.
I was making small-talk with him, and everytime I turned to walk away, he was asking me pretty meaningless questions (as if making me stay a little longer).
That same day, a group of us were talking about birthdays, and he turned to me and said "when is your birthday?" then he said "so what star sign would that make you?" When I told him he just looked at me and smiled. The thing is he didn't ask the same question to anyone else.
Later on, a few of us were having dinner, and he was sat opposite me. I noticed, everytime someone said something funny, he laughed and looked at me straight away, and quite often I could see him looking at me out of the corner of my eye...a couple of times I looked back, and he looked away. But then once I looked back, and he kept looking...then I turned away, looked back and he was still looking, and he held my gaze for a few seconds!
I figure, guys look at girls quite a lot...
Am I being neurotic, and reading too much into him mearly being friendly, or is he flirting?