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A person always complaining like "he is said about you, like that" to another person.
Complaining about you to others and speaking good in front of you like a double game.
Scenario: Guy "a" says to b, "c is talking bad about you" and going to c and telling b is talking bad about you.
2 Going to manager and complaining what that guy said about you at lunch.
What is the right word?
If I'm understanding correctly, what you're talking about is a slang term, two-faced.
From Merriam-Webster:
Two-Faced
adjective
Definition of two–faced for English Language Learners
Not honest or sincere: saying different things to different people in order to get their approval instead of speaking and behaving honestly
Hopefully this is what you were looking for. (:
The activity may also be called backstabbing, and the person doing it a backstabber:
betrayal (as by a verbal attack against one not present) especially by a false friend
from m-w.com
A typical work example would be if two people (A and B) are assigned to a project together. A repeatedly tells B how great it is to be working together and how well B is doing; but A also repeatedly tells the boss that B is not doing their part of the job, and that A should be made the project leader and be allowed to replace B with someone else. Person A is backstabbing person B in that situation.
Talebearer (noun)
Merriam Webster:
one that spreads gossip or rumors;
Webster's Dictionary 1828 - Online Edition:
A person who officiously tells tales; one who impertinently communicates intelligence or anecdotes, and makes mischief in society by his officiousness.
