My friend expects me to cancel plans with other friends to hang out with her?

My friend is my best friend. But she expects me to cancel plans with other friends when she wants to hang out with me, on the basis that she’s “better than my other friends.” Even if I made my plans ages ago, she tries to convince me to cancel on them. I find this to be unreasonable. What can I do?
My friend expects me to cancel plans with other friends to hang out with her?
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