What does it mean when a guy gets defensive when you tell him he's like a brother to you?

Anonymous

My guy friend and I have always had a complicated/flirty relationship. I told him he's like a brother to me. He told me he has enough friends and we'll never be close friends. Later that night he was teasing me and then got serious and quiet and said "I actually think you look cute." What does this mean and why is he so back and forth?

What does it mean when a guy gets defensive when you tell him he's like a brother to you?
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