What does it mean if a boy talks to a girl and the girl ignores the boy and the boy says, "You don't talk to me. If you don't talk to me, I won't talk to you either."

What this boy said is very normal. Then you don’t pay attention to others when they talk to you. What else do they say to you? This is not polite.

If you talk to a boy and he ignores you, will you still talk to him? So sometimes don't always think on your own side, you have to consider other people's feelings. When you ignore others, are they very angry?

When others talk to you, you must talk to them. This is the most basic courtesy. If you want to talk to me, but there is no response from you, then why do people go to talk to you? Don’t they have dignity? Others are not so thick-skinned. Ignore yourself, why bother talking about it. Maybe the boy thinks you hate him, so he won't talk to you anymore.