Trust me, these can be frustrating, too because I know my gender. Lol but it doesn't mean some girls are just like that. There are girls who are being careful especially at this time we are in. But you see that number own, I see it as childish because why give your number in the first place and still ignore? It's better not to give at all. Yes, some play too hard to get, it doesn't mean they are too hard or just trying to waste a guy's time, sometimes, you don't just appear cheap, you have to protect your self worth, too.
But in all, just as it's with girls, same with boys, too. It might just be in levels. Lol