Why would an Aries man play hard to get?

Aries men need someone who can keep them on there toes, they love the feel and joy or chaseing after a woman, If you don't make them work for it they become bored. Also he's just trying to come up with an good excuse why he's not into her anymore. To him the chase is over and there's no more effert to be put in it. If she wants to keep him she needs to challage him.