Is he in the wrong?

I’m friends with two people. I’m friends with this guy who was very friendly and respectful to me since I met him while the other friend, a girl was very rude to me for no reason. She was rude and didn’t like me at first and pretty much tried to get me in trouble multiple times. She complains about everything and even complained mostly about me when she didn’t like me. I don’t remember what happened but me and her became friends. We are really close and she helps me with everything. I met the guy friend months ago and he did some observations and doesn’t like her. He can’t stand her and tells me how he finds her annoying. Who side do I take?

Is he in the wrong?
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