Why is my crush's friend nice to me all of a sudden?

There is this guy I like and I'm certain he likes me back. He stares at me all the time and he comes around a lot but won't say much and when I do talk to him he doesn't say much but he smiles a lot. Lately his best friend has been really nice to me cracking jokes making me laugh when before he never spoke to me. Why is that? Do you think my crush told him about me?
Why is my crush's friend nice to me all of a sudden?
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