Why does he not want me to move during sex?

Like he keeps telling me don't move! Whenever I try he's like you don't have to move don't move! Even when I'm on top... he still tells me you don't have to move! I told him many times that I should move as well, because we always have to take breaks, since he is exhausted.. but he just doesn't want me to. He's very stubborn when it comes to this. He doesn't want to give me a reason. Any ideas?

Why does he not want me to move during sex?
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