Delete those who are willing to send you WeChat.

First of all, he is cold to you and won't take the initiative to come to you, so you deleted the other person's WeChat, but he tried to add you back by phone and message. I think it may be that he doesn't have much free chat time, or that he is under great pressure recently, so he won't take the initiative to chat with you. Maybe he was shy and didn't know how to chat with you, but he gave up when he found that he had lost you.

I think this boy may be introverted and secretive, but he took the initiative to add you back, which shows that he still has you in his heart. He wants to develop further relations with you, but it may be premature.