What does it mean for a boy to suddenly say goodbye when chatting with a girl? Is that girl annoying?

I am a man, too. From my point of view, if you chat with ordinary female friends and classmates, you will not talk about at most two topics except homework. And if I am a girl I like and belong to a talent show, I will take the initiative to leave after talking about a few topics, but if she refuses or continues to talk, as if I didn't see her, I will continue to talk to her. You can continue to talk as if you didn't see it, but don't try too much, otherwise it will cause boredom, or take the initiative to be cold for a while and not take the initiative to find him. If he comes to you for business, such as asking homework, and then chatting with you about other topics, then ... he doesn't treat you as an ordinary classmate, and the rest may be brothers or like you. These two need to see from more places.