He calls me his little sister, but let me tell you, he does not treat me like his little sister.

my close friend of 3 years constantly calls me his little sister. Mind you, I called him my big brother first, so it might be my fault. However, every time we're together, there is this chemistry that just can't be made up. We constantly flirt, tease each other mercilessly (play tease), and constantly smile. When people see us together they think we're dating. We cuddle and he asks me to spend the night at his place. I don't know where his head is. I don't want to mention anything because it might ruin the friendship. We're really close. He stares at me so intensely that I feel swallowed by his gaze. I'm confused.
He calls me his little sister, but let me tell you, he does not treat me like his little sister.
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