I actually like it when some girls play hard to get, but they have to do it right so that they don't repel you. Sometimes they think they're playin hard to get but they don't even hint at all that there's the slightest chance they actually do like ya.. and of course in that situation I would just think that they don't like me and move on. But provided the girl does it right, it can really make people like myself just want them that much more.
Flirt with them in a subtle way, and give out discreet flirtacious hints.. don't make the guy feel like shit or make it seem like you're way out of his league, then he'll just get bored and leave. Just before you part with them each time you see them, say or/and do something somewhat flirtatious to them which will make them think about you until the next time they see you. Remember, when flirting it's more about the TONE you say stuff, i.e HOW you say it, rather than what you say.