Guys, Why did he friend my gay friend who sees me as a sister on social media and not me? No the guy is not gay?

There was a guy that was introduced to me. He seemed to be interested in me. He liked a picture of me that I was tagged in on my friend's wall. Before this we were talking he was asking me what my age was etc. We were talking about culture, language and food. I am just wondering why he friend requested my friend who is like a big brother to me.
Guys, Why did he friend my gay friend who sees me as a sister on social media and not me? No the guy is not gay?
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