I don't know if there is such a person around you
If he says something bad to you, turn around and say it is white to others.
He seems determined that you will never have a chance to confront each other.
Even if there is a confrontation, he can calmly stay out of it, as if it never happened.
Apart from splitting on both sides, I can't think of any other words to describe it
Concept: Some people are born actors