Guys, what does it mean when you tell your best friend about a woman?

I went out with this guy once and when I met up with him the second time. His best friend called him and he told him he was with me at the time. I asked him who that was and he said his best friend. I asked him what did he say about me to his best friend. He said he told him he had met a woman on FB dating and that he had gone out with me.

Why would he tell his best friend about me when we had only gone out once?

Guys, what does it mean when you tell your best friend about a woman?
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