*Easy Points* Why didn't he message me back?

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Ok, me & this boy are both 15. I like him & think he likes me. I've only been speaking to him for not long. He's said to my mate he thinks I'm beautiful & really pretty etc. He's also referred to me in class when saying things he likes about girls. I have him on twitter & DON'T have facebook. So to almost make up for me not having facebook I sent him a direct message on twitter saying my accounts not working properly & then I gave him my number (I sent it at 4pm today 20/3/13) but he didn't reply back or txt me and now its like 11pm. & I know he's been on twitter since as he tweeted but I don't know if he saw the message. He had previously direct messaged me the day before & our convo was short & sweet. Is this normal for 15yr old boys to ignore/play hard to get by not replying to messages from the girl they like? Thanks!