Question
In The Equalizer 2 (2018), while pointing a gun at Miles, Robert talks to him because he is hanging with a gang:
Robert: See, you know what they are up there? They liars, and so am I. See what happens when you deal with a liar? See what happens? I lied to your little punk-ass.
What did Robert lie to Miles about?
Answer
He didn't
Robert is just trying to make a point to Miles that bad things happen when you deal with liars.
He says that he's a liar and that he lied to Miles because he's currently pointing a gun at him and threatening (apparently) to kill him to demonstrate what happens when dealing with liars.
Answered By - Paulie_D