I frequently get a crush on most girls I meet, if they are in any way attractive and fun to talk to. However, 99% of the time, my policy is not to date a girl or even ask her out while I still have this initial crush on her. 1% of the time I violate this rule and I paid for it every time. Cause I can't really see someone's faults then and I don't want to end up getting sucked into a sick relationship. So I generally wait until the giddy feeling has passed, and if I am still interested and everything else is kosher, only then will I make a move.