Just because two lovers quarrel doesn't mean they can do everything. If insulting words are unacceptable to the other party, and the other party will be sad after listening to them. For example, when couples quarrel, girls say to boys, "You are so timid." This sentence will definitely stab the boy like a knife.
If friends say that they hurt each other, they will also make each other sad. Friends are afraid of hurting each other and will naturally use each other. Two people have a good relationship, but the other person won't tell you anything sad, but he won't hide anything from others. When you find that he has a problem and ask him why, he tells you to leave it alone. When you see these three words in your mind, you will feel very sad.