What phrases are instant turnoffs?

What I should not say in any way?

Top three words - "we'll see"

Top three words - "we'll see" - means you aren't honest with her and trying avoid direct answer. 

Second one - "my ex-girlfriend ..." - number one to break your couple.

And angry-maker - "my mom cooks that in different way" - universal trigger. Try this one - and hide ASAP