Hi.... advice or w.e. u wanna say.?

How come i can feel like i like a guy soooo much. and then all of a sudden not like him anymore. like the day before i'd b tellingm y frend how much i like this guy hoo's in my cl, and then the next day i'd b like "eh, he's cool, but don't like him like that any more" ... i think i explained that write... i think