I just broke up with my boyfriend, and he didn't return my text messages. Does that mean he doesn't miss me at all?

There are three reasons. One is that he loves you too much to see such a short message. Seeing it will only break his heart and not want to go back. The second is that his performance now is to see you reply like this. He doesn't think he is good enough for you now. The third is that such a man may really feel that life is very painful. Eating, drinking and having fun are the most important things now. I don't know what kind of boyfriend you belong to, just watch for yourself, but don't overdo it. It's painful to stay with him like this.