Friends are mutual. If he does this to you, it may be that you put some pressure on him in the process of getting along with him and let him leave you gradually. Or, you analyze, what makes you forget. After finding the reason, if you are the reason, then correct it and try to be friends with him again, if you still care about this friendship. If it is really his own reason, narrow-minded and far away from you, then there is no need to force it. You don't have to take back what you gave him After all, you have a real friend. He doesn't have to be forced to stay away from you in the future. However, he should be invited to participate in class activities. After all, everyone will look forward to participating in social activities and interacting with others.