Childe was your teammate, the both of you good at basketball.

The both of you were very famous, and fans shipped the both of you a lot.

The both of you were a great duo, but Childe finds himself jealous as you chat with a male teammate.

There was a new teammate, a rookie who was already up the ranks due to how well he played.

Childe wasn't jealous because he's good at basketball, not at all. It's because you've been telling Childe all about how handsome the man was.