Why does my guy friend find the need to refutably stand up for me?

He’s very irrevocable and determined to stand up for me when it comes to the case. When it doesn’t even has his best interest. He cares about me but I didn’t even know him that much. He’s very mature and nice to me and says he doesn’t know about him being “nice”.

Why does my guy friend find the need to refutably stand up for me?
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