Reflex and complex

My prefix is a part of a reflex
My infix is very complex
my suffix is more than two
but the whole thing is not true

What am I?

My prefix is a part of a reflex

the letter L is part of 'a refLex'

My infix is very complex

$$i = \sqrt{-1}$$ which is very complex

my suffix is more than two

$$e \approx 2.71828$$ which is more than two

but the whole thing is not true

What am I?

a lie