Why do some people pretend not to see someone sending him a message when they clearly see it, and it takes a long time to reply?

Some people obviously see that others have sent him a message, but they always pretend not to see it, deliberately dragging it out for a long time before replying. This may be that he wants to give each other a hint. Or you want to know the mentality of the other party to reply to the message after a long time. In short, he didn't reply to the message in time for a purpose. Such people are usually good at calculating. Dealing with such people is really tiring. If you can't bear such torture, I suggest you choose to separate from him. If you are a same-sex friend, it is not recommended to continue to be friends with him. Such people are not generous.