*Easy Points* Why did he ignore my message?

[Chloe]

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 but he didn't reply back or txt me. 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!