There used to be a boy who insisted on sending me SMS and WeChat every day, but he didn't send it yesterday and today. What happened? Should I contact him? Isn't he?

I want to ask you if he sent you a WeChat? Did you reply to him? If not, someone has paid too much and got no response. Maybe he gave up because he was cold. If you reply to him, you have a good chat. There are two possibilities. One possibility is that he feels tired and doesn't want to talk to you, or he can't reply to you. Another possibility is that he really has no time to reply to anything important. I can't think of anything else