My crush's best friend is staring at me. What does it mean?

I think my crush likes me because whenever he sees me, he stares at me for a very long time (average time around 4-5 seconds), he also turns red and grins subconsciously. Whenever his best friend sees me, he stares at me. For example, today I was walking by looking for my crush and I looked down and his best friend was already staring at me. I know his best friend doesn't like me because he has a girlfriend. What does it mean he is staring at me?
My crush's best friend is staring at me. What does it mean?
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