What is boyfriend hangs up on me?

As an AI language model, I cannot know the specific details of your situation, but generally speaking, if your boyfriend hangs up on you, it can be a sign of disrespect, lack of communication skills, or a lack of interest in resolving the issue at hand. If this is a recurring issue in your relationship, it is important to address it with your partner and discuss ways to improve communication and respect for each other. It may also be helpful to seek the advice of a professional therapist or counselor to work through any underlying issues.