"I Don't Know" is my middle name IDK Have told him this for years

 he always wants definitive answers

concrete 

absolute information

I don't have it

I DONT KNOW

I say

he hates that 

expects me to know and also does not want me to know at the same time

because if I DO KNOW then he calls me a KNOW IT ALL
and says YOU think you KNOW EVERYTHING don't you