We dated for 3 months and have been hanging out ans sleeping togrther for 5 months now. He isn't dating or sleeping with anyone else and neither am I. The last time I asked him when we were together why he is being so difficult he said "just to keep you guessing". What does he mean by that and why do it? He is quite a bit older than me too and very mature with all aspects ot his life which makes this confusing.