Thanks, chary. I agree with those who said it's like dating, kind of. In a friendship context it is harder to understand, though--while you may not feel "that way" about a potential date, I personally feel you can never have too many friends. But...
Mrs. Robinson, we were both working yesterday and she was on a deadline before the Bank Holiday weekend. True, of course. I am not even that bothered, I just think it is kind of funny, because I know and can tell that this person is really shy (as well as, as she would be the first to describe herself, really British). I like your suggestions to try other expats as well. I was resistant at first, but sometimes it's just nice to hear a familiar language so to speak--and it is nice, once in a while, to talk to someone who understands the experience. I think if someone has always lived in a country they just naturally feel like it's home, without giving it thought or choice.
Thanks again for all the good suggestions!