This is about a case that happened years ago that I was never sure about. I sometimes feel the urge to know how things work. This one keeps popping up in my head. I'll tell a short story, then anyone that wants can take a hack at it. I was searching books in the computer at a college library. I went to the staff counter to ask a question. A fairly attractive girl answers and I go on. After that, this particular girl gives me a warm greeting every time she sees me. For example, I'm sitting on a couch reading and she says, "Hello", as she goes by shelving books. One day I pretend to be looking at books in the isle she is in and strike up a conversation by asking what course she is doing. After we exchange a few words on that she says that she is going to another isle and pushes off. This greeting thing goes on and I make another move; I turn around and ask her to lunch one day after we pass outside. At that point she says, "I have a boyfriend, if that changes anything." I just chuckle slightly and say nothing. She says, "Like what? Just to eat?" I stay silent. She turns to face me and looks like she is trying to think as she says something about when she might be available. She ends up just saying that she has to get to class and she'll see me around. Next time I pass her she is walking with some friends and the instant she sees me she smiles and waves. Some time later I stopped going to the college. The End. The question is, what was happening here? There have been various hypotheses. I don't know what to conclude.