Girls are attracted to guys that have strong self-confidence. Girls also wants what they can’t have… If a guy is unattainable he is definitely more attractive, I am not saying that you should be unattainable but you can pretend being it.
For example if you have a lot of girls around you (female friends) that laughs and have fun with you… then all the other girls clearly sees that you are fine good with girls. This probably means that you don’t have any problem getting girls, so it should also mean that you are more selective than other guys. So then you are probably harder to get as well.
To find out more about how to attract girls read my story.