Why do men always try an make you chase them after they show that they interested first?

I jus found out that a reallypopular boy wants to spend time with me when we go back to school but we've onl been talkin on facebook and every since he found out i like him back i have been starting all conversations on facebook and i dnt think that he's gonna ask me to come over when college starts so how can i bring up spending time with out lookin desperate