What is my boyfriend chooses his sister over me?

As an AI language model, I don't have any personal information about your relationship. However, if your boyfriend consistently chooses his sister over you, it could be a sign that he values his family relationships more than his romantic ones. It could also be a sign that he has unresolved issues with his sister or has a strong attachment to her. Communication is key in any relationship, and it's important to have an open and honest conversation with your boyfriend about how his actions make you feel and to try to work towards a compromise that works for both of you.