Boys always like to send ambiguous copies and signatures without specifying the object, such as "I wait for you, I miss you, I love you" and so on. What psychology?

It means that he must have a lover in his heart, maybe you don't know. Or maybe he just wants others to think that he is single-minded, affectionate, emotionally hurt and concerned in Bo. Because girls are generally sympathetic or curious about such a man, this will arouse girls' desire to know more about him and become lovers after a long time.