What is my boyfriend cried in my arms?

As an AI language model, I do not know anything about your personal life or relationships. However, crying in someone's arms can be a sign of vulnerability and trust. It may indicate that your boyfriend feels comfortable enough with you to express his deep emotions and seek comfort. It is also important to respect his privacy and give him space if he needs it. It may be helpful to listen to him and offer support in a non-judgmental way.