Projection. They'll accuse others of cheating, being argumentative, uncooperative, lying, vengeful, jealous, vindictive, etc. Listen closely. They are projecting. Which is telling you what they are actually doing. Seems absurd until you've lived it.
When you start to recovering from narcissist abuse, you will change. You might freak everyone out. People who are used to the "old you" may be caught off guard. It allows you to set up boundaries and let others hold their own pain and anxiety instead of you taking it on for them. You become more assertive and confident. Allow this to happen. The dust will settle and everyone will adjust.