Should i say yes? please answer its an easy 10 pts?

the guy who sits across from me in homeroom keeps in asking me out. another guy came over to our table and asked William if he liked me.he said he knew Willaim never lied. and William said he had the option of not answering the question.every1 said you so like her. and he just smiled. and i blushed. a little while later he said we have so much in common we should like date and then he said we have so much in common we should like makeout. well i like him too. if he asks me out again (which im sure he will) should i say yes. and does he really like me or is he just playing along