A guy I'd known in friendly terms for a few weeks asked me round his house. When we were inside his house the conversation was totally different to how he had been before. He became really odd and started asking me why I was doing that. When I asked 'doing what?' he said if I didn't know then he wasn't going to tell me. I think I had a lucky escape but part of me is trying to make sense of it and I'm over-analysing my communication style. What on earth could he have meant or is he insane?