When you send messages to your boyfriend, he always refuses to reply on the pretext of being busy. What does this mean?

In the past, I would be 100% sure that he didn't love you that much. But nothing is absolute. I am a close friend. I'm in love with her boyfriend, but her boyfriend just can't get back to me, sometimes for a week. My best friend is wronged by him every day, and I want to break up. I broke up several times, but I finally got back together. People around her advised her not to be with him. In fact, I didn't see them much at that time, because my best friend was actually good-looking, with good figure and skin, and her boyfriend was nothing outstanding, but she was dead set on love. They got married yesterday. In fact, that boy is very kind to her except that the news comes back slowly and sometimes he can't be contacted for a long time. They are actually very happy.