I met a guy at a school party and we chatted for a bit. Now whenever he sees me at school he always says hi and he tried to talk to me once about school. He talked to me last week, and I was surprised that he remembered my name since we last met was few months ago and we only talked for few minutes. Yesterday, I was at the library reading and when I looked up I noticed he was looking at me, so he waved and smiled. Is he just a nice / friendly guy or is he interested?