I've been in my current role two years, it has been a hard slog. It's better paid than my previous role and I could do it fairly easily, if it were not for my manager.
She has a history of making employees lives very hard, setting difficult/unattainable goals, playing games in general and pushing people out of jobs when she fancies. Others have made formal complaints in the past but not real action is taken, management is weak and it's not a large company.
I can see her erratic behaviour starting to push me out - difficult/unattainable tasks, gossip and misinformation. I've probably fulfilled my purpose to her now and she's planning moving me on.
Aibu to nod and smile and find another job in coming months? It's not necessarily easy and I may have to take a pay cut. Morally I know I should raise a grievance but realistically she's evaded culpability for ten years (!!) in her role, so contesting the situation would likely be stressful and pointless.