"They tend to be naïve. They assume that cooperation should be the basis of all social transactions, and they avoid conflict (which means they avoid confronting problems in their relationships as well as at work). They continually sacrifice for others. This may sound virtuous— and it is definitely an attitude that has certain social advantages— but it can and often does become counterproductively one-sided. Because too-agreeable people bend over backwards for other people, they do not stand up properly for themselves. Assuming that others think as they do, they expect— instead of ensuring— reciprocity for their thoughtful actions. When this does not happen, they don’t speak up. They do not or cannot straightforwardly demand recognition. The dark side of their characters emerges, because of their subjugation, and they become resentful.
You might think, “if they loved me, they would know what to do.” That’s the voice of resentment. Assume ignorance before malevolence. No one has a direct pipeline to your wants and needs— not even you. If you try to determine exactly what you want, you might find that it is more difficult than you think. The person oppressing you is likely no wiser than you, especially about you. Tell them directly what would be preferable, instead, after you have sorted it out. Make your request as small and reasonable as possible— but ensure that its fulfillment would satisfy you. In that manner, you come to the discussion with a solution, instead of just a problem. Agreeable, compassionate, empathic, conflict-averse people (all those traits group together) let people walk on them, and they get bitter. They sacrifice themselves for others, sometimes excessively, and cannot comprehend why that is not reciprocated. Agreeable people are compliant, and this robs them of their independence."
Peterson, Jordan B.. "12 Rules for Life: An Antidote to Chaos"