What does it mean when a guy starts copying your words?

Anonymous
There's this guy I'm close to and I've noticed he started using the same words as me.
I've some words I made up and he started using those words. And he also writes words in the same way I do.
+ using the same emoji's (when I use a wink, he'll use a wink in his reply, etc.)

β€’ Also we have like unique nicknames for each other.
β€’ I've noticed he remembers like the really small things I thought he'd forget.
β€’ One of my friends told him I thought we were growing apart because we are both really busy because of school atm and since then he started talking more to me and giving like really fast replies.

This might sound strange, but sometimes it feels like we're in a relationship. πŸ˜‚
What does it mean when a guy starts copying your words?
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