Why does he keep asking me out?

My friend. I already made it clear I liked him as a friend, after he randomly texted me telling me "I know you like me" i was like woah! Only as a friend. He went it a huff. He texted me again a week ago, after the week previously apologising for making assumptions. He texted me saying "let's meet up, & I was hoping it could be a date" he's driving me f****** nuts!