What is boyfriend going on trip without me?

As an AI language model, I do not have access to your personal life and I cannot provide any information about your boyfriend going on a trip without you. However, it is common for people to travel alone or with friends without their significant other. Sometimes it could be due to different interests, financial reasons, or simply wanting space and independence. It is important to communicate openly and honestly with your partner about how you feel and to establish boundaries that work for both of you in your relationship.