Polyamory

Hello, I am a woman starting down the path of polyamory and I have a question. How do you cope with your primary partner saying that how he treats you and others will be exactly the same? I feel like it is supposed to be a bit of a difference, seeing as I am the primary partner of his, but I am not sure if this is supposed to be a thing. I am extremely new to all of this, and I don't want to cause any issues, but I'm not sure who to talk to in regards to things like this. I am open and hoping for responses to help me understand this better. I created an account on here because it seems like a lot of people are good at explaining things for others to understand better. I don't want to ruin what he and I have, but I just want to understand better. Any advice would be greatly appreciated.