What if a primary school classmate who hardly chats with you suddenly asks you for WeChat, and then sends you a voice saying that he likes you very much from primary school?

It may be true. Some people don't necessarily say it when they like it, and it takes a long time to talk to you. This kind of saying may be said on QQ or WeChat. I have a junior high school best friend. Long after graduation, a male classmate in our class confessed to her that he had liked her for a long time, but he didn't say it because he was shy and didn't want to ruin this classmate relationship. She didn't do anything during her three years in junior high school. She was surprised when she was confessed, and we were surprised, but he said that she really liked her. Maybe your situation is similar to this one. Maybe he thought about it later and kept it in his heart for a long time. Maybe he didn't expect you to be with him in his heart.