A boy often sends text messages to girls to buy things, but then he never sends text messages again? Why?

A boy often buys things and sends text messages to a girl. This signal is very clear, that is, boys like girls and want to chase her. However, when the boy worked hard for a period of time, he found that the girl had nothing to say to him at all, just wanted to sign for the boy's things, and there was no reply. This is not particular. Send messages to girls and don't answer them. After a long time, it is normal for boys not to send text messages. Because of hopeless efforts, no one will try again stupidly, so give up decisively.