After three years of love, I (the girl) always called him, and he rarely took the initiative to call and send text messages. What does this mean?

Once, one of my boyfriends was too busy at work and ignored me. He never comes to see me at school. I went to see him. Later, because I couldn't stand his indifference, I broke up. After breaking up, he pestered me that he would change, but a leopard cannot change his spots, right? I'm still very happy now. . He seldom sends messages, maybe because he is shy, maybe he is used to your greetings, but maybe you are not important enough for him to think about you all the time. I hope you can be happy.