What's the name of a friend who often doesn't return text messages?

My best friend always takes a long time to reply, and sometimes he doesn't even reply. He said that sometimes he just doesn't want to reply, but he will reply when he sees news from others. This is mainly because others are just ordinary people and have no intimate relationship, so he will reply to each other quickly out of a friendship for others and because of face. Your girlfriend thinks that he and you are good friends and girlfriends, so it will take some time to reply to you, even in. If you are particularly close here, he must be. I'll get back to you