What does it mean that girls deliberately slow down and return messages?

I don't know yet. Girls want their boyfriends to keep fresh with themselves forever. This trick of hers is called playing hard to get. She wants you to be nervous about her, so you can say hello to her at this time. Fool, you worried me to death. Don't reply to my messages slowly in the future. I think she will be very happy. Because you care too much about her. Hehe, people in love always become stupid.