Why did he mention this girl?

To the pretty cliche title, I have a pretty cliche question.
There is this guy whom I love 100%, and he tells everything about his day to me. And he mentioned a girl and said casually that it's fun to talk to her. I got a little scared lol because he said they are not just classmates, but friends.

Please confirm that I am unnecessarily anxious lmao.
Why did he mention this girl?
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